Patent Application
20050259966
1. Field of the Invention
The present invention relates to an information record apparatus and method, as well as an information reproduction apparatus and method, such as a DVD recorder or a DVD player. The present invention further relates to a computer program product to make a computer function as such an information record apparatus and the like.
2. Description of the Related Art
At present, terrestrial digital broadcasting, BS digital broadcasting, and the like have been already begun, so that audio-visual environment presenting a high quality digital broadcasting becomes more popular even at home. In such a kind of digital broadcasting, it is possible to enjoy content information having quality of high vision broadcasting (hereinafter referred to as HD (High Definition)) or HDTV, superior to content information having quality of so-called standard broadcasting (hereinafter referred to as SD (Standard Definition)) or SDTV.
On the other hand, since the content information broadcasted by such a kind of digital broadcasting is digital data, the copying of the content information does not tend to deteriorate the image quality. Thereby, the copying is easy. For this reason, the copying of the digital data (or the content information of the digital broadcasting) makes a problem in protecting the copyright. In order to protect the copyright, various approaches for protecting the copyright is on their development, as disclosed in Japanese Patent Application Laid-Open Nos. 2000-324443, 2000-298926 and Hei 9-171658, for example. Particularly, CPPM (Content Protection for Prerecorded Media) or CPRM (Content Protection for Recording Media) employed in a record medium such as the DVD or the like for protecting the copyright is a technology for preventing an illegal or unauthorized copy, in which the copyright of the content may be appropriately protected by putting a “copy once limitation” on the content information.
The “copy once limitation” has been put on all programs (or content information) broadcasted in Japan from April, 2004, in the terrestrial digital broadcasting and the BS digital broadcasting, in order to protect the copyrights.
This “copy once limitation” allows a so-called “move operation” only in which the original content information recorded in a hard disk or the like is deleted, if the content information recorded in the hard disk is moved into/onto another record medium such as the DVD. For example, some users tend to record HD content information into a hard disk at home and then record this HD content information into a DVD or the like in order to enjoy this content anywhere out of home. In this case, the HD content information recorded in the hard disk is recorded as another SD content information into the DVD or the like and this original HD content information is deleted from the hard disk, in conformity with the move operation. This move operation allows transferring the content information with the “copy once limitation” into/onto another record medium, while suitably protecting the copyright of the content information.
In this case, even if the user wants to enjoy the HD content information again, it is impossible to enjoy the HD content information, because there is remained only the SD content information. Such a situation is inconvenient in that it may prevent a spread of the digital broadcasting, and may detract advantages of information devices such as hard disk recorders.
The present invention has been accomplished in view of the above problems. It is therefore an object of the present invention to provide an information record apparatus and method, an information reproduction as well as apparatus and method, allowing the HD content information and SD content information to be viewed suitably, while suitably protecting the copyright thereof. It is further an object of the present invention to provide a computer program product for making a computer function as such an information record apparatus and the like.
(Information Record Apparatus)
In the present invention, the information record apparatus is provided with: a down-convert device for down-converting a first content information having a first reproduction quality recorded in a first record medium into a second content information having a second reproduction quality which is lower quality than the first reproduction quality; a first record device for recording the second content information into a second record medium; a first delete device for deleting the first content information recorded in the first record medium, if the second content information is recorded in the second record medium; and a scramble device for generating scramble information by scrambling the first content information, on the basis of a predetermined scramble key.
According to the information record apparatus, the first content information having the first reproduction quality (HD) recorded in the first record medium is down-converted into the second content information having the second reproduction quality (SD), by the operation of the down-convert device. In this case, the second reproduction quality is lower quality than the first reproduction quality. In other words, the second reproduction quality is inferior to the first reproduction quality. Thereby the data size of the second content information is smaller than that of the first content information. Then, the generated second content information is recorded into the second record medium, by the operation of the first record device.
On the other hand, once the second content information is recorded into the second record medium, the first content information is deleted from the first record medium by the operation of the first delete device. Thereby, the copyright of the content information can be suitably protected in conformity with the move operation.
Particularly in the present invention, the first content information is scrambled on the basis of the scramble key, by the operation of the scramble device. As a result, the scramble information is generated from the first content information. The term, “the scramble” herein means a processing for converting a certain kind of content information representing a predetermined image or the like into another kind of information (i.e. scramble information) incapable, by itself, of representing such a predetermined image or the like. That is, the scramble information itself does not represent various images sounds or the like, but it becomes the information (specifically, the first content information) representing various images, sounds or the like when the data processing with the scramble key is performed to the scramble information. Therefore, insofar as the scramble information is generated, the copyright of the content can be protected suitably.
Then, as mentioned later, the first content information can be generated from the scramble information, on the basis of the scramble key. Therefore, the user can enjoy the content information having the first reproduction quality on the basis of the scramble information, even after the content information down-converted into the second reproduction quality is recorded into another record medium, while the copyright of the content is suitably protected. That is, for example, even in the case that a relatively high definition digital broadcasting program is recorded into the first record medium and then this program is down-converted into a relatively low definition program to be recorded into the second record medium, it is possible to enjoy this program as the relatively high definition program again. Of course, it is possible to enjoy this program as the relatively low definition program.
As a result, according to the information record apparatus, the user can suitably enjoy the content information having desired reproduction quality (e.g. the first reproduction quality corresponding to HD quality as mentioned below, or the second reproduction quality corresponding to SD quality as mentioned below), while the copyright of the content is protected.
In an aspect of the present invention, the information record apparatus is further provided with: a second record device for recording the scramble information into the first record medium.
According to this aspect, various kinds of operation as mentioned below (especially a kind of operation for generating the first content information) can be suitably performed, by means of the scramble information recorded in the first record medium.
In another aspect of the present invention, the information record apparatus is further provided with: a key generate device for generating the scramble key, on the basis of information readable at least from the second record medium.
According to this aspect, for example, it is possible to generate the scramble key inherent to the second record medium into which the second content information is recorded. In other words, in order to generate the scramble key, the second record medium into which the second content information is actually recorded for example is required. That is, the term “scramble key” herein is a key that cannot be generated unless using the information read at least from the second record medium. For this, illegal or unauthorized generation (or copying) of the scramble key can be effectively prevented. Therefore, even if someone obtains the scramble information illegally or incorrectly, this someone cannot generate the scramble key easily, resulting in the suitable protection of the copyright of the content.
In this aspect of the present invention, the readable information may include information inherent to the second record medium into which the second content information is recorded. Furthermore, the readable information may include at least a part of the second content information. Furthermore, the readable information may include: an encryption key to be used for protecting a copyright of the second content information; and information required for generating the encryption key.
In these arrangements, the illegal or unauthorized generation (or copying) of the scramble key can be prevented more effectively, or more robustly, resulting in more suitable protection of the copyright of the content.
In another aspect of the present invention, the information record apparatus is further provided with: an information generate device for generating the first content information, on the basis of the scramble information and the scramble key, respectively.
According to this aspect, it is possible to generate the higher definition first content information, on the basis of the scramble information and the scramble key. That is, the original first content information can be generated, by descrambling the scramble information on the basis of the scramble key. Therefore, the user can enjoy the first content information again, even after the first content information is down-converted into the second content information and this second content information is recorded into another record medium.
In this aspect of the present invention, the information record apparatus is further provided with: a third record device for recording the generated first content information into the first record medium; and a second delete device for deleting the second content information recorded in the second record medium, if the generated first content information is recorded into the first record medium.
In this arrangement, the copyright of the content can be suitably protected, since the second content information is deleted from the second record medium in the case that the generated first content information is recorded into the first record medium by the operation of the second delete device.
(Information Record Method)
In the present invention, the information record method is provided with: a down-convert process of down-converting a first content information having a first reproduction quality recorded in a first record medium into a second content information having a second reproduction quality which is lower quality than the first reproduction quality; a first record process of recording the second content information into a second record medium; a first delete process of deleting the first content information recorded in the first record medium, if the second content information is recorded in the second record medium; and a scramble process of generating scramble information by scrambling the first content information, on the basis of a predetermined scramble key.
According to the information record method, various benefits and advantages can be obtained similarly to the case of the information record apparatus as mentioned above.
Incidentally, the information record method of the invention can be embodied in various aspects, similarly to various aspects in the information record apparatus of the invention.
(Information Reproduction Apparatus)
In the present invention, there is presented the information reproduction apparatus for reproducing the second content information, which is recorded in the second record medium by the information record apparatus according to the present invention as mentioned above, with desired reproduction quality. The information reproduction apparatus is provided with: an information generate device for generating the first content information, on the basis of the scramble information and the scramble key, respectively; and a first reproduction device for reproducing the generated first content information.
According to the information reproduction apparatus, it is possible to generate the higher definition first content information on the basis of the scramble information and the scramble key. That is, the original first content information can be generated by descrambling the scramble information on the basis of the scramble key. Therefore, the user can enjoy the first content information again, even after the first content information is down-converted into the second content information and this second content information is recorded into another record medium.
Consequently, according to the information reproduction apparatus, the user can enjoy the content information having desired reproduction quality (especially the first reproduction quality), while the copyright of the content is protected.
In an aspect of the present invention, the information reproduction apparatus is further provided with: a second reproduction device for reproducing the second content information.
According to this aspect, the user can enjoy suitably the second content information also.
(Information Reproduction Method)
In the present invention, there is presented an information reproduction method of reproducing the second content information, which is recorded in the second record medium by the information record apparatus mentioned above, with desired reproduction quality. The information reproduction method is provided with: an information generate method of generating the first content information, on the basis of the scramble information and the scramble key, respectively; and a first reproduction method of reproducing the generated first content information.
According to this information reproduction method, various benefits and advantages can be obtained similarly to the case of the information reproduction apparatus as mentioned above.
Incidentally, the information reproduction method of the invention can be embodied in various aspects, similarly to various aspects in the information reproduction apparatus of the invention.
(Computer Program Product)
In the present invention, there is presented a computer program product in a computer-readable medium for tangibly embodying a program of instructions executable by a computer to make the computer function as at least one of the down convert device, the first record device, the first delete device and the scramble device of the information record apparatus according to the present invention as mentioned above (including various aspects).
In the present invention, there is presented a computer program product in a computer-readable medium for tangibly embodying a program of instructions executable by a computer to make the computer function as at least one of the information generate device and the first reproduction device of the information reproduction apparatus according to the present invention as mentioned above (including various aspects).
According to the computer program products, the information record apparatus and the information reproduction apparatus may be embodied relatively easily, by reading and running the computer program product from a record medium, such as a ROM, a CD-ROM, a DVD-ROM, a hard disk and so on, storing the computer program therein/thereon, or by downloading the computer program product to the computer via the communication device and running it.
Incidentally, the computer program product of the invention can be embodied in various aspects, similarly to various aspects in the information record apparatus or the information reproduction apparatus of the invention.
The nature, utility, and further features of this invention will be more clearly apparent from the following detailed description with reference to preferred embodiments of the invention when read in conjunction with the accompanying drawings briefly described below.
As discussed above, the information record apparatus or method according to the present invention is provided with the down-convert device, the first record device, the first deleted device and the scramble device, otherwise the down-convert process, the first record process, the first delete process and the scramble process. Furthermore, the information reproduction apparatus or method according to the present invention is provided with the information generate device and the first reproduction device, otherwise the information generate process and the first reproduction process. Therefore, the user can enjoy the content information having desired reproduction quality, which the copyright of the content is protected.
Now, exemplary embodiments of the present invention are discussed, with reference to drawings.
(Fundamental Structure)
Firstly, an explanation is made on an exemplary fundamental structure of the embodiment of the information record reproduction apparatus as the embodiments of the information record apparatus and the information reproduction apparatus according to the present invention, with reference to
As shown in
The hard disk 10, which is a specific example of “the first record medium” according to the present invention, is a magnetic record medium capable of recording various kinds of data. Especially, the hard disk has a larger volume of record capacity than that of the optical disc 20.
The hard disk drive 11, which is a specific example of “the second record device”, “the third record device” or “the first delete device” according to the present invention, is adapted to record various kinds of data into the hard disk 10 or to delete various kinds of data from the hard disk 10.
The optical disc 20, which is a specific example of “the second record medium” according to the present invention, may be an information record medium in a disc-like form having 12 cm diameter such as a DVD.
In particular, the optical disc 20 used for this embodiment of the information record reproduction apparatus 1 is a re-writable optical disc (e.g. a DVD-RW etc.) in conformity with CPRM.
The optical disc drive 21, which is a specific example of “the first record device” or “the second delete device” according to the present invention, is adapted to record various kinds of data into the optical disc 20 or to delete various kinds of data from the optical disc 20.
The HD decoders 31 and 41 are adapted to decode HD stream. That is, they are adapted to generate data of HD quality image as a specific example of “the first content information” according to the present invention by decoding HD stream compressed (or encoded) in a MPEG2 format.
Incidentally, this embodiment has two HD decoders. Nevertheless, an embodiment having only one HD decoder is feasible.
The down-converter 32, which is a specific example of “the down-convert device” according to the present invention, is adapted to convert data of a HD size image (1920×1080 pixels) into data of a SD size image (720×480 pixels).
Incidentally, in this embodiment, in order to distinguish images from view point of their pixel quantity, terms “HD size image” and “SD size image” are used as seen in the above paragraph. On the other hand, an image having pixels as many as the HD size image and actually presenting HD image quality is especially referred to as an HD quality image. Furthermore, an image having pixels as many as the SD size image cannot naturally present HD image quality. Therefore, the SD size image may be referred to as an SD quality image as appropriate.
The SD encoder 33 is adapted to compress (or encode) the data of SD size image converted by the down-converter 32 in MPEG2 format. After this MPEG2 compression, SD stream is obtained.
The CPRM circuit 34 encrypts or decrypts various kinds of data (or streams) recorded or to be recorded into the optical disc 20, in conformity with CPRM, for the copy protection.
The key memory 35 is adapted to store a scramble key used for a scramble process of an HD stream or a descramble process of scramble data. Incidentally, this scramble key will be mentioned later in detail (see
The SD decoder 36 is adapted to decode the SD stream. That is, it is adapted to generate data of SD size image (i.e. data of SD quality image) as a specific example of “the second content information” according to the present invention by decoding SD stream compressed (or encoded) in MPEG2 format.
The scramble circuit 38, which is a specific example of “the scramble device” according to the present invention, scrambles HD streams read from the hard disk 10, on the basis of the scramble key outputted from the key memory 35. As a result, it can generate the scramble data.
The descramble circuit 42, which is a specific example of “the information generate device” according to the present invention, descrambles the scramble data read from the hard disk 10, on the basis of the scramble key outputted from the key memory 35. That is, the scramble data is subjected to a data processing inverted to the aforementioned scramble processing. As a result, HD stream can be generated.
The CPU 50 is adapted to control an entire operation of the information record reproduction apparatus 1 (i.e. various components enclosed within an outer frame of solid line in
The memory 51 includes a semi-conductor memory such as RAM (Random Access Memory) or flash memory for temporarily and recordably storing various kinds of data required for the operation of the apparatus 1.
Incidentally, from among various kinds of component in the information record reproduction apparatus 1, components enclosed within a short dashed line 1a in
Furthermore, it should be noted that a data-bus for intervening various components is partially omitted in this block diagram for the simplicity. For example, if a SD stream is recorded in the hard disk 10, this SD stream is outputted to the SD decoder 36 via a part of data-bus (not shown), so that the SD quality image is reproduced.
Furthermore, arrow shaped marks depicted on the data-bus illustrates directions of data IO (Input and Output) as only an example. Those skilled in the art will understand that directions of data 10 are not limited to this example.
(Operational Principle)
Now, an explanation is made on the operational principle of this embodiment of the information record reproduction apparatus, with reference to
(1) Move Operation
Firstly, an explanation is made on a move operation of the embodiment of the information record reproduction apparatus 1, with reference to
As shown in
Then, the read HD stream is decoded by the operation of the HD decoder 31 (step S102). This decoding generates data of HD quality image before the MPEG2 compression (hereinafter referred to as “HD data” as appropriate).
Then, the decoded HD data is inputted to the down-converter 32. Then, the HD data is converted into another data of SD size image (hereinafter referred to as “SD data” as appropriate) by the operation of the down-converter 32 (step S103).
Then, the SD data is inputted to the SD encoder 33. Then, a SD encoding (i.e. MPEG2 compression) process is performed to the inputted SD data by the operation of the SD encoder 33 (step S104). As a result, a SD stream is generated.
Then, a CPRM process is performed to the SD stream (step S105). Specifically, a encryption key is generated depending on a device key prepared for the information record reproduction apparatus 1, a media key (e.g. MKB (Media Key Block)) pre-recorded in the optical disc 20, an ID number inherent to the optical disc 20 or others. Then, on the basis of this encryption key, the contents to be recorded (the SD stream in this case) are encrypted.
Then, the encrypted SD stream is recorded into the optical disc 20 (step S106).
At this timing, the following operation is performed, along with the recording operation of the SD stream into the optical disc 20, which is already explained with reference to until step S106.
Specifically, the HD stream is read, separately from reading the HD stream at step S101a (step S101b). Then, the HD stream read at step S101b is inputted into the scramble circuit 38 (step S107).
Furthermore, a scramble key for the scramble process is generated, under control of the CPU 50 as a specific example of “the key generate device” according to the present invention, on the basis of the SD data encoded at step S104 (i.e. the SD stream generated by the operation of the SD encoder 33) (step S108).
Now, the scramble key is explained specifically. The scramble key may be generated on the basis of the SD stream to be recorded into the optical disc 20. For example, the scramble key may be SD stream data (e.g. data for each frame) corresponding to a reproduction time point of the HD stream to be inputted into the scramble circuit 38. Alternatively, the scramble key may be at least a part of the SD stream. Furthermore, the scramble key having a data size smaller than that of the HD stream may be used repeatedly to perform the scramble process, which is mentioned below. Furthermore, since the SD stream (or a part thereof) is used as the scramble key, the optical disc 20 in which the SD stream is actually recorded is required for the descramble process as mentioned below. Therefore, if a copyright of the optical disc 20 (especially, contents recorded in the optical disc 20) is protected by the CPRM as in this embodiment, a copy (especially an unauthorized copy) of scramble key can be prevented more effectively.
The encryption key used for encrypting the SD stream in the CPRM circuit 34 may be used as the scramble key. Alternatively, the scramble key may be generated on the basis of the encryption key. Thereby, a copy (especially an unauthorized copy) of scramble key can be prevented more effectively.
Furthermore, the scramble key may be generated on the basis of various kinds of information required for generating the encryption key.
Alternatively, the scramble key may be generated, on the basis of the information inherent to the optical disc 20 in which the SD stream is to be recorded, such as the media key or the ID number as mentioned above, or other kinds of ID number or the like. Thereby, the optical disc 20 in which the SD stream is actually recorded is required in order to generate the scramble key. Therefore, a copy (especially an unauthorized copy) of scramble key can be prevented more effectively.
In other words, it is preferable to generate the scramble key inherent to the SD stream or the optical disc 20 in which the SD stream is to be recorded, in order to prevent the scramble key from being easily copied (i.e. preventing the scramble data from being easily descrambled). Thereby, even if an unauthorized person gets the scramble data, he/she cannot copy the scramble key easily, resulting in the failure in obtaining the HD stream. Thus, a copyright of the contents can be advantageously protected.
Of course, a predetermined kind of data other than the above examples may be used as the scramble key. Nevertheless, it is preferable to use the above examples as the scramble key, in view of protecting the copyright of the contents.
Incidentally, in an SSL (Secure Socket Layer) which may be used for encrypting data when the data is transferred (transmitted/received) on the network, a key of 128 bits in size is used to encrypt the data. Nevertheless, in this embodiment, it is preferable to perform the scramble process with the scramble key of more than 128 bits in size, in order to advantageously protect the copyright of the contents. For example, as mentioned above, the scramble process may be performed with the scramble key having a size as large as a data amount of one frame.
Then, the generated scramble key is inputted to the key memory 35 (step S109). Then, the scramble key is inputted to the scramble circuit 38 (step S110).
Then, on the basis of the scramble key inputted at step S110, the HD stream inputted at step S107 is scrambled, by the operation of the scramble circuit 38. As a result, the scramble data is generated (step S111).
Here, the HD stream corresponding to the scramble key may be read from the hard disk 10 in accordance with the timing of generating the scramble circuit 38, and inputted into the scramble circuit 38, so that the scramble data is generated. Alternatively, the HD stream corresponding to the scramble key (or a part of the HD stream to be scrambled with the scramble key) may be inputted to the scramble circuit 38, while adjusting the timing for outputting the scramble key to the scramble circuit 38 in accordance with the timing for inputting the HD stream to the scramble circuit 38. In this case, the adjusting of the timing is performed in the key memory 35.
In the scramble circuit 38, the scramble data may be generated by performing a logical operation such as a calculation for an exclusive-OR of the scramble key and the HD stream. Alternatively, the scramble data may be generated by performing a predetermined operation (e.g. a shift operation etc.) for the HD stream data, on the basis of the scramble key. In other words, it is desirable to generate the scramble data which does not present any meaningful image or sound by itself until when descrambled with the scramble key, and after this descrambling, presents some meaningful image or sound. That is, “the scramble process” in this embodiment means a process of converting a kind of data presenting a predetermined image or the like into another kind of data presenting no predetermined image or the like by itself.
Then, while the scramble data is recorded into the hard disk 10 (step S112), the HD stream is deleted from the hard disk 10 (step S113). In this case, the scramble data may be recorded into the hard disk 10 in such a manner that the HD stream is overwritten with the scramble data.
Conclusively, the SD stream is recorded into the optical disc 20, and the HD stream is deleted from the hard disk 10. Furthermore, the scramble data is recorded into the hard disk 10. An explanation is made on various statuses of data recorded in the hard disk 10 and the optical disc 20, respectively, with reference to
As shown in
As the move operation progresses, the HD stream is deleted gradually from the hard disk 10, as shown in
When a whole SD stream is recorded into the optical disc 20, the whole HD stream is totally deleted from the hard disk 10 and the whole scramble data is recorded instead, as shown in
Incidentally, the move operation is performed in such a manner that the HD stream corresponding to SD stream to be recorded into the optical disc 20 is deleted. In other words, the move operation is performed in such a manner that the HD stream indicating an image corresponding to an image indicated by the SD stream recorded in the optical disc 20 (e.g. of the same frame) is deleted from the hard disk 10 at the same time when the SD stream is recorded. For example, the SD stream is recorded into the optical disc 20 and the HD stream is deleted from the hard disk 10, by 1 minute (or a few minutes or a few seconds) of reproduction time unit. However, a recording of the SD stream and the scramble data and a deletion of the HD stream may be performed in any mode and any sequence, insofar as the copyright of the contents is suitable protected even in the case that the recording of the SD stream and the scramble data and the deletion of the HD stream is not performed as mentioned above.
Thus, according to the embodiment of the information record reproduction apparatus 1, the copyright of the contents can be suitable protected.
Incidentally, in the aforementioned embodiment, it is preferable that the HD stream is sequentially read, and the operation from step S101 to step S113 is sequentially performed to the read HD stream. That is, there is no need to read the whole HD stream relating to one contents recorded in the hard disk 10 and to perform the operation from step S101 to step S113 to the whole HD stream at one time, but it is sufficient to read sequentially a part of the HD stream within a manageable size of the information record reproduction apparatus 1 (e.g. within a unit of few frames), for the aforementioned move operation.
(2) Reproduction Operation of HD Quality Image after Move Operation, and Move Back Operation (HD)
Now, an explanation is made on the reproduction operation of the HD quality image after the move operation and the move back operation (HD), with reference to
Incidentally, the “move back operation” means an operation for recording the data after the move operation into the original record medium. Specifically, after the move operation is performed so that the data recorded in a record medium (original medium) is recorded into another record medium, the data recorded in the another record medium is recorded again in the original medium. This operation is referred to as the move back operation. Especially, the operation of recording the data into the original medium as the HD stream is referred to as the move back operation (HD), in order to distinguish from the operation of recording the data into the original medium as the SD stream, which is referred to as the move back operation (SD).
As shown in
Then, under control of the CPU 50, the scramble key is generated from the SD stream (step S108). The same scramble key is generated in the same manner as in the scramble key generate process during the move operation.
Then, the generated scramble key is inputted into the key memory 35 (step S109), and then is inputted to the descramble circuit 42 (step S204).
Along with these steps, the scramble data is read from the hard disk 10 (step S201). Then, the read scramble data is inputted into the descramble circuit 42 (step S202). In this case, the scramble data may be inputted into the descramble circuit 42 in accordance with a timing of generating the scramble key at step S108 (or a timing of inputting the scramble key into the descramble circuit 42). Alternatively, the scramble key may be inputted into the scramble circuit 42 in accordance with a timing of inputting the scramble data into the descramble circuit 42.
Then, the scramble data inputted at step S202 is descrambled, on the basis of the scramble key inputted at step S204, by the operation of the descramble circuit 42. As a result, the HD stream is generated (step S205). That is, the HD stream is generated by performing an inverse operation of that of generating the scramble data in the scramble circuit 38 as mentioned above. In this case, it is preferable to input the scramble data into the descramble circuit 42, synchronously with the corresponding scramble key by a frame unit (i.e. frame by frame). For example, during the move operation as mentioned above, as user data (or additional data) of the SD stream, a head offset address of the corresponding scramble data on the hard disk 10 may be recorded, or a table including therein the head offset address may be recorded on the hard disk 10.
Then, the generated HD stream is decoded by the operation of the HD decoder 21 (step S102). Thereby, the HD data is generated. Then, the generated HD data is reproduced (step S206), so that the user can view the HD quality image.
If the information record reproduction apparatus does not generate the scramble data as in the case of the conventional hard disk recorder or the like, it is impossible or difficult to reproduce the SD stream as the HD quality image, after the move operation in which the HD stream recorded in the hard disk 10 is converted into the SD stream (i.e. down-converted). Furthermore, up-converting the SD data makes it possible to reproduce the SD data as the HD size image having pixels as many as the HD data, but it is hardly makes it possible to reproduce the SD data as the image having the HD quality.
According to the embodiment of the information record reproduction apparatus 1, however, even after the HD stream is converted into the SD stream and then recorded into the optical disc 20, it is possible to reproduce the HD quality image again by performing the reproduction operation with the scramble data as mentioned above. Furthermore, even if the HD stream is converted into the SD stream and then recorded into the optical disc 20, only the scramble data which is quite different from the original HD stream or the SD stream is recorded in the hard disk 10, so that the copyright of the contents is suitably protected.
Therefore, at home or the like, the user can enjoy high quality images on a wide screen such as a plasma television or a projector, by reproducing the HD stream recorded in a high-end information record reproduction apparatus such as a hard disk recorder. On the other hand, the HD stream may be converted into the SD stream and then recorded into the optical disc 20 such as a DVD, so that the use can enjoy the same contents even in a car with the aid of a DVD player mounted on the car (or a DVD player mounted on a car navigation system). That is, the great advantage can be presented in that the user can enjoy any desired content with any desired quality, both at home where the high-end AV environment may be obtained and in a car where a simple AV environment may be obtained.
On the other hand, in addition to or instead of the aforementioned reproduction of the HD data, the HD stream generated in the descramble circuit 42 may be recorded into the hard disk 10 (step S207). That is, the move back operation (HD) may be performed.
Along with this recording operation of the HD stream, the SD stream recorded in the optical disc 20 is deleted (step S208). Thereby, the copyright of the contents can be protected. The user can enjoy the HD quality image recorded again on the hard disk.
In this case, it is preferable to delete the scramble data recorded in the hard disk 10. Thereby, it is possible to utilize the record capacity of the hard disk 10, more effectively.
(3) Reproduction Operation of SD Quality Image after Move Operation and Move Back Operation (SD)
Now, an explanation is made on the reproduction operation of the SD quality image after the move operation, as well as the move back operation (SD), with reference to
As shown in
The SD stream whose encryption is decrypted is decoded, by the operation of the SD decoder 36 (step S301) to generate the SD data. Then, reproducing the generated SD data (step S302) allows the user to enjoy the SD size image (i.e. SD quality image).
On the other hand, instead of or in addition to the aforementioned reproduction of the SD data, the SD stream whose encryption is decrypted may be recorded into the hard disk 10 (step S303). That is, the move back operation (SD) may be performed.
Along with this recording operation of the SD stream, the SD stream recorded in the optical disc 20 is deleted (step S208). Thereby, the copyright of the contents can be protected. Then, the SD stream read from the hard disk 10 is decoded by the operation of the SD decoder 36, so that the SD quality image is reproduced.
In this case, it is preferable to remain the scramble data recorded in the hard disk 10 as it is, for the later reproduction of the HD data.
Thus, even in the case that both the SD data and the scramble data are recorded in the hard disk 10, the user can enjoy the HD quality image, by generating the scramble key from the SD stream and descrambling the scramble data in the descramble circuit 42, as in the case of “the reproduction operation of the HD quality image after the move operation”.
Furthermore, this recording of contents as the SD stream into the hard disk 10 makes it possible to achieve the fast move operation, without any complicated data processing (e.g. down-converting, encoding, decoding, etc.) for the move operation.
(4) Reproduction Operation of HD Quality Image after Move Back Operation (HD)
Now, an explanation is made on the reproduction operation of the HD quality image after the move back operation (HD), with reference to
As shown in
Incidentally, the reproduction operation discussed in this section is the same as the reproduction operation of the HD stream recorded in the hard disk 10 before the move operation.
As discussed above, according to this embodiment of the information record reproduction apparatus 1, it is possible to reproduce the HD quality image again by performing the reproduction operation with using the scramble data as described above, even after the HD stream recorded in the hard disk 10 is converted into the SD stream and then recorded into the optical disc 20. If the HD stream is recorded into the hard disk 10 or the optical disc 20 after the down-converted, only the scramble data quite different from the original HD stream or the SD stream is recorded in the hard disk 10, so that the user can suitably enjoy the contents exhibiting desired reproduction quality, while the copyright of the contents is protected.
Incidentally, in the aforementioned embodiments, the optical disc 20 is a re-writable optical disc (e.g. a DVD-RW etc.) in conformity with CPRM. But the optical disc 20 may be a recordable optical disc (e.g. a DVD-R) in conformity with CPRM.
Furthermore, in the aforementioned embodiments, the hard disk 10 and the optical disc 20 has been discussed as an example of the record medium, and the recorder (or player) for the hard disk 10 and the optical disc 20 has been discussed as an example of the information record reproduction apparatus. Nevertheless, the present invention is not limited to the hard disk and the optical disc, or the recorder (player) therefor, but may be applied to other various kinds of record medium and the recorder (player) therefor.
The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The entire disclosure of Japanese Patent Application No. 2004-138443 filed on May 7, 2004 including the specification, claims, drawings and summary is incorporated herein by reference in its entirety.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2004-138443 | May 2004 | JP | national |
