Patent Application
20090271399
The present disclosure relates generally to communication systems having a primary service provider and a partner service provider, and more particularly, to a method and system for securely communicating searching content at a primary service provider through a partner service.
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Communication systems such as pay or subscription communication systems include a primary service provider and a user receiver device such as a set top box or integrated receiver decoder. The user device is typically provided with authorization to communicate with the primary service provider and receive services therefrom. One example of such a system is a satellite television system such as DIRECTV®. Conditional access is provided at the user device in the form of a card that allows the user device to receive and process signals from the primary service provider.
Allowing other service providers to interact with and provide different services that supplement the primary service, may be desirable. However, security must be maintained between the device and the partner service and the primary provider.
While interaction between primary and partner providers may take place, providing access to content for the primary service provider is important. The primary service provider may continually be adding new content and thus allowing users to access such content is important.
The present disclosure allows the security to be maintained between a primary provider and the partner provider so that searching of content listings at a primary service provider may be performed through the partner provider. The content searched may be linear content, non-linear content or both linear and non-linear content. For clients of the primary provider, the searching may be performed in a customized manner by allowing subscribed services and local content to be searched.
In one aspect of the invention, a method includes generating a search request for search data at a user device, communicating the search request to a partner service provider, communicating the search request from the partner service provider to a primary service provider, generating search results data at the primary service provider, communicating search results data to the user device, and displaying the search results on a display device associated with the user device.
In another aspect of the invention, a system includes a user device, a partner service provider in communication with the user device, and a primary service provider in communication with the partner service provider. The user device generates a search request for search data at the user device and communicates the search request to a partner service provider. The partner service provider communicates the search request to a primary service provider. The primary service provider generates search results data and communicates search results data to the user device. The user device displays the search results on a display device associated with the user device.
Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. For purposes of clarity, the same reference numbers will be used in the drawings to identify similar elements. As used herein, the term module refers to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that provide the described functionality. As used herein, the phrase at least one of A, B, and C should be construed to mean a logical (A or B or C), using a non-exclusive logical or. It should be understood that steps within a method may be executed in different order without altering the principles of the present disclosure.
While the following disclosure is made with respect to example DIRECTV® broadcast services and systems, it should be understood that many other delivery systems are readily applicable to disclosed systems and methods. Such systems include wireless terrestrial distribution systems, wired or cable distribution systems, cable television distribution systems, Ultra High Frequency (UHF)/Very High Frequency (VHF) radio frequency systems or other terrestrial broadcast systems (e.g., Multi-channel Multi-point Distribution System (MMDS), Local Multi-point Distribution System (LMDS), etc.), Internet-based distribution systems, cellular distribution systems, power-line broadcast systems, any point-to-point and/or multicast Internet Protocol (IP) delivery network, and fiber optic networks. Further, the different functions collectively allocated among a service provider and integrated receiver/decoders (IRDs) as described below can be reallocated as desired without departing from the intended scope of the present patent.
Further, while the following disclosure is made with respect to the delivery of content (e.g., television (TV), movies, games, music videos, etc.), it should be understood that the systems and methods disclosed herein could also be used for delivery of any media content type, for example, audio, music, data files, web pages, games, etc. Additionally, throughout this disclosure reference is made to data, information, programs, movies, assets, video data, etc., however, it will be readily apparent to persons of ordinary skill in the art that these terms are substantially equivalent in reference to the example systems and/or methods disclosed herein. As used herein, the term title or program will be used to refer to, for example, a media content type such as a movie itself and not the name of the movie.
Referring now to
The user device 26 may include a satellite television receiver, set top box or a digital video recorder. The satellite television receiver may also be referred to as an integrated receiver decoder. Of course, other types of user devices may be used such as a cable television set top box. Other types of user devices may include a mobile device such as a lap top computer, cellular phone, personal digital assistant, a portable media player or an automotive-based television receiving device. Thus, the user device may be a fixed user device in the case of a satellite television set top box or a mobile user device. Both fixed and mobile devices may be used in a system.
The primary service provider 14 may also include an account/billing web service 30 and an authentication server 32. The authentication server 32 may include an encrypted token (eToken) web service 32A and a setup web service 32B. The eToken web service 32A may be used to generate and validate eTokens. The generation and validation process will be further described below. The setup web service 32B may be used to setup or establish information so that an eToken may be generated. The set-up process will be described further below.
The primary service provider 14 may also include a conditional access management system 34. The conditional access management system 34 may be used to grant conditional access to various programming as well as provide recording commands to the user device 26 as will be described below.
The primary service provider 14 may also include a data web service 36. The data web service 36 may include a programming guide web service 36A, a customer care web service 36B and a remote booking web service 36C.
The program guide web service 36A may be used to generate program guide data and information regarding various programming that is available. The program guide web service 36A, as will be described below, may generate custom programming guide information based upon the subscription to which a user is subscribed. The program guide web service 36A may also provide generic or non-customized content when specific user attributes are not known. When user attributes such as location and subscription information are known, only the content available to the particular subscriber may be included in the program guide. Additional content may be provided for advertising purposes. Thus, channel data for particular channels may be provided in the program guide.
The program guide web service 36A may generate program guide data for both linear and non-linear content. Linear content are television shows broadcasted at a particular time and a particular channel. Network television programming is an example. Non-linear content is programming that is not tied to a particular time such as on-demand content that can be requested at the user's discretion.
The customer care web service 36B may be used to generate and provide users with various types of help mechanisms to resolve technical issues.
The remote booking web service 36C may be used to generate remote booking commands or recording instructions as will be described below. The remote booking commands or recording instructions may be transmitted through the uplink antenna 18 to the satellite 12 and downlinked through the downlink signal 22 to an antenna 24 on the user device 26. A remote booking command may then initiate the user device 26 to store content broadcast by the satellite 12 thereon.
A guide search web service 36D may be used to provide searching capabilities to customers of the partner service provider. The searching may take place using stored data within traffic and scheduling system 38. The searching as described below may be for linear content, non-linear content or a combination of linear and non-linear content. Both types of content could be made available to customers of the primary service provider to search. Customers of the partner service provider and not of the primary service provider may also be provided with access to linear content and potentially non-linear. This may allow potential primary service provider customers to see the wide variety of choices provided by the primary service provider. Non-customers of the provider system may be referred to as a generic user. Generic users may thus be provided with search results from national channels and local channels, if location information is provided.
The user device 26 is in communication with the primary service provider 14 through a network 40. The network 40 may be a secured network or use a secure protocol. The network 40 may include a broadband network through which the user device 26 communicates with the primary service provider 14. The network 40 may be a wired network such as a public-switched telephone network (PSTN) or a broadband Internet network. The network may be wireless such as a cellular or wireless Internet system. The broadband network may communicate wired, wirelessly or a combination of both. For example, the user device 26 may include a wireless antenna 42 for communicating with an antenna 44 of a router 46 which, in turn, is in communication with the network 40.
The network 40 may also be an intranet. The components of both the primary and partner service provider may be located separately or in the same building.
The user device 26 may be associated with a display 50 for displaying content and programming, as well as displaying various types of user commands, or the like. The display 50 may be a television or display integrated into the device. The display 50 may include speakers for an audio display. The display 50 may be used for displaying primary content from a primary service provider and secondary content from a secondary service provider.
The user device 26 may include a user interface 52, such as a keyboard, remote control, or the like, for selecting and entering various types of information by the user. The user device 26 may also include a conditional access module 54 that allows the user to access the programming provided from the content system 16. The conditional access module 54 may be referred to as an access card. The conditional access module 54 may include various activation codes without which the user device is not activated. The conditional access module 54 may include a conditional access module identifier such as a number or a code.
The user device 26 may also include a network interface 56 for interfacing with the network 40. For example, the network interface 56 may communicate wirelessly through the antenna 42 or through a direct connection such as an Ethernet connection. The network interface 56 may be but is not limited to a wireless broadband interface, a broadband interface, a modem-type interface or a public-switched telephone network interface.
The user device 26 may also include a storage device 58. The storage device 58 may store various content received from the primary service provider therein. The content may be received through the satellite 12 or through the network 40 through the network interface 56. The storage device 58 may be a hard disk drive or memory chip-based device. The storage device 58 may be referred to as a digital video recorder.
The primary service provider 14 may be in communication with a partner service provider 80. The partner service provider 80 may include a partner web application 82, a program guide cache 84, and a setup web page module 86. The partner web application 82 may generate various types of web content. For example, the partner web application 82 may generate a homepage-type display. The homepage display may receive information from the program guide cache 84 to fill a TV listing portion of the homepage display.
The setup web page module 86 may be used to setup various types of user network devices to communicate with the partner service provider 14 as will be described below.
The partner service provider 80 may also include a guide search index 88. The guide search index 88 may be in communication with the data web service 36 and, in particular, the guide search web service 36D. The guide search index 88 may enable the partner service 80 to obtain search criteria from a user, client or client device interacting with the partner service provider 80. Operation of this interface is described below.
The system may also include a user network device 90 that includes a display 92 associated therewith. The user network device 90 may be a web browsing device such as a portable computer, a personal digital assistant, a portable video player, an automotive-based user device, or the like. The user network device 90 may receive various data from the partner service provider 80 which may include a web page. The display 92 may be used for displaying various program guide information, along with other information provided by the partner service provider. The other information may include financial information, weather information, voicemail information, or other types of information. The partner service provider 80 may provide the content to be displayed on a website in various manners together with or in addition to the program guide information or other information.
An intermediate web provider 94 may also be included in the system. The intermediate web provider 94 may be used for communication between the primary service provider 14 and the user network device 90. The intermediate web provider 94 may be used to receive content or content clips from the primary service provider and store them therein. The user device 90 may obtain the content or content clips from the intermediate web provider 94 through the network 40 as will be further described below.
The intermediate web provider 94 may also communicate with the partner service provider 80. Rather than talking or communicating directly with the intermediate web provider 94, the user network device 90 may communicate with the partner service provider 80 and then to the intermediate web provider 94. This may allow another type of service to have access to the content on the intermediate web provider 94.
The traffic and scheduling system (TSS) 38 is used to provide search information such as the channel, program associated data (PAD), channel information, program information packets (PIPs). The traffic and scheduling system 38 will support searches in various fields of stored information relative to available programming. For example the information from the TSS 38 may be searchable using keywords in fields such as but not limited to Program Title, Program Category, Program Credits Channel Short Name or in one or more specific fields such as but not limited to Program Title, Episode Title, Program Description, Program Category, Program Credits and Channel Short Name. The searching may be performed for linear content as well as nonlinear content.
It should be noted that the components (82-88) within the partner service provider 80 may be physically located together with the primary service provide 14. The components are distributable individually or together. The primary service provider 14 may have these components as a mere convenience to enable the partner service to quickly provide certain services offered by the primary service provider 14.
The primary service provider 14 may also include a television listing server (DLS) database 104. The television listing server database 104 may include data corresponding to various listings for various program times and schedules. The television listing server database 104 may be in communication with the partner service provide. More specifically, the television listing server database 104 may be in communication with the program guide cache 84.
Referring now to
Referring now to
The partner service provider 80 may include the program guide cache 84 as set forth above. The cache 84 is illustrated in
The program guide data may be communicated from the television listing server database 104 through the router 102 to the router 100 and stored within the program guide web service and cache 84. A virtual private network tunnel 110 may be established between the router 100 and router 102 for transferring the data therethrough. By providing the program web service and cache 84 at the partner service provider 80, delays due to network connections may be reduced since the user network device 90 will not have to wait for program guide data to be transferred through the network between the primary service provider 14 and the partner service provider 80.
The program guide web service and cache 84 may each be in parallel with a firewall 108A and 108B. The output of the program web service and cache 84 may be provided to the partner web interface 112. The partner web interface 112 may be used to direct program guide data to the user network device 90.
Referring now to
In step 200, after the user enters the various information into the setup web page, the information is communicated from the partner service provider, and, in particular, the setup web page to the setup web service 32B. The information may be communicated through the network 40 of
In step 202, the account/billing web service 30 may receive the information at the primary service provider 14 through the network 40. The various information such as the internal identifier or account identifier may be provided to the account/billing service 30. The process may be first started by validating or authenticating the site identifier provided by the partner service provider. Thereafter, the internal account or ID may be authenticated.
In step 204, once the site identifier and the internal or account identifier are authenticated, a status signal is communicated to the setup web service 32B. The status may include a non-authenticated status.
If the status is positive, meaning the authentication has taken place, an encrypted token or eToken may be generated at the setup web service 32B in step 206. The eToken may be formed using various combinations of identifiers but may include a site identifier, a site user identifier, and a DIRECTV® internal identifier or account identifier. The eToken may also have an expiration date and/or time specified therein. The expiration date may have a current date time in which the eToken was formed and an elapsed time through which the eToken is valid. The elapsed time may be in seconds that are counted from the current time when the eToken is formed. Thus, the lifespan of the eToken is set forth. In subsequent authentication requests, if the expiration time is still valid, authentication may not be necessary. The eToken may be returned without modification if the eToken is still valid. If the expiration time has expired, re-authentication may be required and a new token may be generated with an updated expiration date and time.
In step 210, the partner service provider may also be used to obtain various data from the data web service 36 of the primary service provider 14. The partner service provider will thus not have individual customer or user information associated therewith. Therefore, the site identifier may be provided and dummy values or no values at all for the specific user information described above may be communicated to the setup web service 32B. If the site ID is a valid site ID as determined in the setup web service 32B, an eToken is generated using the site ID and dummy values if needed in step 212.
After the eTokens have been returned in steps 206 and 212, the web service or web application 82 in
In step 216, the information such as the site ID, the site user ID and the eToken may be communicated to the eToken web service 32A at the primary service provider 14. Authentication may decrypt the eToken and ensure that the site ID and the site user ID correspond with the site ID and the site user ID of the eToken. Authentication will be further described below. In step 218, the eToken and internal or account identifier may be returned once the authentication takes place in step 216. The return signal may return back to the web service 36. The web service 36 may then generate a web service response in step 220. The web service response may include an updated eToken if the eToken was expired and data from the web service 36.
Referring now to
In step 328, the status, the new eToken and the program guide data may be communicated to the partner device. In step 330, the various data as received from the data web service of the primary service provider may be communicated to the user network device.
Referring now to
In step 436, the partner web application and/or the setup web page module may receive the eToken. In step 438, the user information and the eToken are associated together. Thus, the user may only have to perform the setup web page service one time. Step 440 may be performed if step 412 indicates that the user has registered before. Also, step 440 is performed after step 438. In step 440, the web service request from the user network device 90 of
Referring now to
In step 520, if the expiration time is greater than the current date and time, step 524 is performed. In step 524, if the expiration time is less than or equal to the current date and time, step 526 is performed. Step 526 authenticates the eToken internal identifier. If the eToken internal identifier is not valid in step 528, an error message is returned in step 530.
If the eToken internal ID is valid, step 532 updates the eToken expiration time. In step 534, the updated eToken is returned and the internal ID is communicated to the web service. In step 536, a web service response is generated.
In step 538, the updated eToken is communicated to the partner service provider 80.
Referring now to
The channel object data may include the primary visible content channels valid between the listing start date and the end date. The channel data may include channels provided by the primary service provider as well as turnaround channels provided by the primary service provider. The channel object may comprise various information such as a channel key which is a unique key made up of the content channel identifier and the channel start time that identifies the channel instance. The content channel identifier specifies the identifier for the content channel. The channel start time and channel end time specify the starting and ending time that the channel is valid. Certain channels may be valid indefinitely and some channels may be valid only for a predetermined amount of time. The channel object may also include a channel object identifier. This specifies the content key in the provider system that maps to the content channel identifier. A major channel number and minor channel number may also be used as an identifier. A market identifier corresponding to a designated marketing area corresponding to the Nielsen® geographic data may also be set forth. National broadcast channels may not specify a market identifier. A source identifier may also be provided for the channel. For example, various sources for the channel identifier may be provided including Tribune Media Services. The station ID may also be provided in the channel object. A short name and long name corresponding to the call letters or the channel may be provided. A description, category, service type, codec type, network affiliation, channel logo ID and authorization code may also be provided. The authorization code may correspond to fully subscribed, partially subscribed, not subscribed or not applicable. The authorization code may allow users to view information if the information has been subscribed to.
Schedule data may also be provided which includes the air time for a particular program, the duration that includes the length of time that the program will air, an authorization code similar to those described above including subscribed, not subscribed and not applicable, and a blackout code to determine if the content may be blacked out.
Program data may also be provided. Program data may use a program reference identifier that is used to uniquely identify the program record and its contents. The program title, the episode title or the sports team's name may also be provided. A theatrical release year, original air date, a description describing the program content may also be provided. A secondary identifier such as a tribune media services identifier may also be provided in the program data. A category, label such as a category or genre may also be provided. The relevance of the category label may also be categorized. An in-guide flag may also be provided which indicates whether or not the label should appear with the program description on the screen. A credit, contribution, last name, first name, source type and network/syndicator-type may also be provided. Indicators may also be provided as to whether the program is in color, provides a secondary audio program, whether the program is a repeat, a premiere or a finale and whether the program is live, taped or taped delay. Other information may include whether the content is subtitled, letterboxed and the ratings of the particular content. An advisory may also be provided in the program data. An advisory may correspond to motion picture advisories. A television advisory may also be provided for television content that includes TVY7, TVPG, TV14, TVMA. A close-captioning indicator, a high definition indicator, an AC3 audio content indicator, a Dolby surround sound indicator, pay-per-view data, an all-day ticket data or a descriptive video service data may also be provided.
IRD data or set top box data may also be returned to the partner service provider. This information may be used to schedule a recording from the user network device. The partner service provider may use the IRD or user device information to target specific IRDs corresponding to the subscriber's account. The IRD or user device information may include a receiver ID that identifies the partner service receivers. The access card identifier may also be provided. The model number of the user device, the manufacturer of the user device and the location within the customer's premises may also be provided. The various numbers of receiving devices or user devices may be provided with a customer account. Therefore, a specific user device may be specified. The receiving device data may also include a remote booking allowed flag. This flag may indicate whether or not remote booking is allowed.
In step 626, the guide listings are returned that include the local channels, national channels and subscribed channels and the various data described above. In step 628, a program may be requested using the channel detail, the program detail and the user device data.
Referring now to
In step 822, the conditional access packet may be communicated to the user device. The conditional access packet may be a recording instruction for a particular program at a particular time on a particular channel. In step 824, a response data may be generated from the primary service provider to the partner service provider. The response data may include a successful transmission of a conditional access packet to indicate that the user device may record the information within the storage device 58. After step 824, a new eToken with a new timestamp may be provided from the primary service provider and, in particular, the eToken web service 32A with a new timestamp. As mentioned above, a new timestamp may be provided if the previous timestamp has expired.
In step 828, the content may be recorded according to the recording request or conditional access packet as described above. The content is then able to be used and/or played back at the convenience of the user of the user device.
It should be noted that
Referring now to
In step 912, a plurality of clips is communicated to an intermediate web provider. The clips may be provided to the intermediate web provider in response to a query from the intermediate web provider if more current clips are available. The clips may also automatically be provided to the intermediate web provider.
In step 914, an identifier from a user network device is communicated to the intermediate web provider. The user network device may communicate various identifier-type information including an account number or other type of login and/or password. In step 916, the user device is authenticated. The user device may be authenticated at the intermediate web provider, or the identifier data may be communicated to the primary service provider. In step 916, the networks device is authenticated. In step 918, the service options to receive the content may be determined. For football clips, for example, the user may be required to subscribe to a Sunday football package. Both the authenticating and the verifying may take place either at the intermediate web provider or at the primary service provider. Both the authentication and verification may take place at the same time.
In step 920, if the user network device is not verified or authenticated, step 922 ends the process. In step 920, if the user network device has been verified and authenticated, step 924 communicates a content list to the user network device from the intermediate web provider. The content list may include a list of a number of the most recent NFL clips, in carrying forward with the example set forth above. For example, a list of five may be provided.
In step 926, content may be selected from the list to form a selection at the user network device. In step 928, the selection is communicated to the intermediate web provider. In step 930, the content corresponding to the selection is communicated to the user network device.
In step 932, the content may be displayed on the user network device. That is, the content video may be played back through the user network device. As mentioned above, the user network device may be various types of devices, including a mobile phone or other type of web-enabled device. It should be noted that the content list in
Referring now to
The program guide search index server 1012 may generate an initial load signal to the DIRECTV® listing system 104 which is part of the event scheduler or traffic and scheduling system 38. The initial load request for content information or program guide information may take place using a Remote Method Invocation (RMI) format. Likewise, the listing system 104 may also provide an update notification to the program guide search index server. The update notification may also take place using RMI format. When initially established, the program guide search index server obtains an initial load for a pre-determined number of days of available content. This may be for both linear and non-linear content. Periodic updates are provided through using update notifications so that current information is provided and searched by the partner system.
Each of the requests provided by the partner service provider may include the eToken information that is described above with respect to
A search request may be generated at a user device and communicated through a network to the partner service provider 80A, 80B. The SOAP request is provided to the primary service provider through the program guide search web server. Authentication of the request may take place through the authentication web service 32 and the account web service 30. The program guide search web server 1010 may communicate an RMI request to the program guide search index server and receive search results which are communicated back to the respective partner service providers and ultimately to the user devices associated with the partner service providers.
Referring now to
In a field search, various fields may be selected. Boolean searching may take place using “AND” or “OR”, Operations using “AND” means the search string has to appear in all specific fields and an operation “OR” means the search string needs only appear in one of the specific fields to make the records be selected as a search result. The fields may include but are not limited to the program title, the episode title, the program description, the program category, the program credits and the channel short name. As will be mentioned below, various other types of ranges may also be provided.
In step 1114, the content type may also be specified in a search. The content type may be three different types that include a linear content type, a non-linear content type and a combined content type. The combined content type includes both linear and non-linear data. If the client or user specifies linear data, then only linear data will be searched. Likewise, if non-linear data is searched, both will be searched. If a specific type is not specified, then both linear and non-linear may be searched.
In step 1116, a time range may also be specified. The time range may correspond to a time range of air time for a field of search. This may be an optional input for linear data since non-linear data does not have a specific air time. Both the time range and content type may be specified in the search request.
In step 1118, the sorting order may also be provided as part of the search request. The sorting order may be specified to match a score or an air time. The higher the score on the list, the higher the rank. If programs have the same score, then they may be sorted in ascending order by air time.
Indexing the search results may also have indexing options that are processed by the search engine against various indexed fields such as program title, episode title, program description, program category, program credits, and channel shortening. Various boost factors may be adjusted using the program guide search system's XML configuration files. In one example, the program title may have the maximum boost compared to the rest of the indexed fields.
In step 1120, it is determined whether the client (which is a client of the partner service provider), has a primary provider service account. If the user is not a customer of the primary service provider, generic search results may be provided in step 1122.
Referring back to step 1120, if the client does have a provider account, customized results based upon the user's subscribed services and/or zip code or both may be provided in step 1124. A list of channels available to search on may be provided based upon the user's zip code and national channels plus local channels for the user's local market.
Referring now to
In step 1212, updates from the listing system 104 may be provided to the program guide search index service 1012 of
In step 1214, the request for a search is provided to the program guide search web service 1010 of
In step 1218, a remote method invocation (RMI) request may be provided to the program guide search index server 1012 of
In step 1220, a search may be performed at the program guide index server for the particular search request. As mentioned above, the search request may identify the type of search, the content of the search, the time range of the search, and the sorting order of the search or combination of any of the above.
In step 1222, the search results are returned to the user through the program guide search web server 1010 of
The Program Guide Search service will return all schedule data matching the specified search criteria in the request. Examples of possible Request Data are set forth in the following tables.
Examples of field types for a search are set forth in the following table.
An example of a time range search request is set forth in the table below.
Examples of response data from the search are set forth below.
Additional examples of authentication code and blackout code response data are set forth in the following table. These codes are applicable when a subscriber is subscribed or a program is blacked out.
It should be noted that the data in the above tables is set forth by way of example. In an implementation, not all of the tables or all of the examples within a table may be used.
Those skilled in the art can now appreciate from the foregoing description that the broad teachings of the disclosure can be implemented in a variety of forms. Therefore, while this disclosure includes particular examples, the true scope of the disclosure should not be so limited since other modifications will become apparent to the skilled practitioner upon a study of the drawings, the specification and the following claims.
This application claims the benefit of U.S. Provisional Application No. 61/048,445, filed on Apr. 28, 2008. The disclosure of the above application is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 61048445 | Apr 2008 | US |
