Patent Application
20060242572
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Embodiments of the present invention relate to a system and method for implementing a viewer for protected content and in particular to a system and method for integrating the viewer with other software applications.
Authors of documents and other users often wish to transmit documents in a fixed file format, such as a PDF file. Transmitting a document in a fixed file format ensures that the document remains intact and is not edited or otherwise altered.
When a fixed-file document is received, a software application known as a viewer is used to view the document. Viewers for fixed-file documents, such as Acrobat for PDF, have previously been implemented as independent applications. These applications are invoked, for example, when an operating system recognizes a well-known component in the files name, usually an extension, such as “.pdf.”
When a viewer is implemented as stand-alone application, users of the viewer are responsible for ensuring the viewer is functioning. Typically, a user is required to download, install, and maintain the software. The user may also be responsible for ensuring that the correct viewer is invoked for a particular version of content, and that that software will run on the installed operating system platform
In addition, viewers implemented as external applications and invoked by file extension can be easily replaced or substituted. This introduces the risk of a malicious replacement of the viewer and reduces user confidence in the viewer.
Furthermore, because the viewer is a stand-alone application, customizations made in the operating system are not typically reflected when viewing fixed-format documents. For example, a visual theme selected in the operating system may not be reflected when viewing documents. This may disrupt the overall experience when switching between different content types.
Accordingly, a solution is needed for providing a viewer that does not require a user to download, install, and maintain the software. In addition, there is a need for a viewer with enhanced security protection that increases user confidence. Furthermore, there is a need for a viewer in which customizations made in the operating system are reflected when viewing documents.
Embodiments of the present invention include a method for viewing a fixed-format document. The method may include receiving a document into a viewer integrated with an application program interface and determining whether the document is of a predetermined fixed-format content type. The method may also include presenting the document to a user via a web browser if the document is of the predetermined fixed-format content type.
In additional aspects, a system for viewing a fixed-format document is provided. The system may include an application program interface and a viewer. The viewer may be integrated with the application program interface, and the application program interface and the viewer may be installed in a single installation.
In still further aspects of the invention, a user interface system for generating a fixed-format document is provided. The user interface system may include a user-selectable print-to-fixed-format option, presented to a user in a document's native environment, that generates a fixed-format document in accordance with an application program interface. The fixed-format document may be viewable via a viewer, the viewer being integrated with the application program interface.
The present invention is described in detail below with reference to the attached drawings figures, wherein:
I. System Overview
A system and method are provided for implementing a fixed-format viewer. The viewer may be used to view documents of a predetermined file format.
The system may include a terminal 200, which may be configured to receive input 202 from a network, a disk drive, a CD ROM, or the like. The terminal 200 may further include storage 203. The terminal 200 may further include an Application Program Interface (API) 204 and a viewer 206. The viewer 206 is implemented, for example, as an integrated part of the API 204, and is installed concurrently with the API 204.
The terminal 200 may further include an operating system 207 and a web browser 208, which retrieves and displays web pages. The terminal 200 may also include or communicate with a display 210, which displays information to a user.
Fixed-format files may be received, for example, from the input 202, or may be retrieved from storage 203. When a user wishes to open a fixed-format file, the user so indicates, for example, by double-clicking on an icon representing the file. The operating system 207 may then invoke the viewer 206. Furthermore, the web browser 208 may be invoked, for example, either by the operating system 207 or by the viewer 206. The web browser 208 opens a window used to display the fixed-format document, or otherwise provides a host environment for the fixed-format document. The fixed-format document is presented to the user via the display 210, in the host environment provided by the web browser.
In one implementation, the API 204 determines the format of a fixed-file document, for example, by identifying a file extension or other relevant information. When it is determined that the fixed-file document is of an appropriate format, the API 204 invokes the viewer. The API 204 further includes methods used to host applications in the browser 208. These methods are used to view fixed-file documents in the browser 208.
Because the viewer 206 is incorporated into the API 204 or is installed concurrently with the API 204, the viewer 206 can be included as a trusted component of the API 204. Thus, applications using the API 204 can guarantee that the viewer 206 will not make untrustworthy requests of the web browser 208, the operating system 207, or any other related application.
Furthermore, the viewer 206 is implemented as a sealed application class within the API 204. Because the viewer is a sealed application class, input or inheritance are disallowed, both from other internal applications (other applications incorporated into the API 204) and from external applications that use the API 204. This implementation ensures that malicious users cannot derive or extend the application, so that content originating from the viewer may be trusted.
Because both content and requests originating from the viewer are trusted, it is unnecessary to present the user with information regarding potential hazards. Thus, dialog boxes warning of potential hazards may be eliminated, resulting in increased consumer confidence in the viewer.
Because the viewer 206 displays documents hosted in the web browser 208, the user is presented with a fixed-format document that has the appearance of a web page. This allows the user to utilize features of the web browser 208, such as navigating through the document using the web browser's 208 “forward” and “back” buttons.
Furthermore, because the viewer 206 is included in the API 204, the viewer 206 can utilize the visual theming set for internal applications. Thus, continuity of user experience may be preserved, even when switching between content types.
In addition, the viewer 206 may interface with a graphics and presentation engine, such as the Microsoft Avalon graphics engine. This allows the viewer 206 to inherit benefits of the graphics and presentation engine, allowing for enhanced presentation of gradients, 3-dimensional images, graphics, text, and the like.
II. Exemplary Operating Environment
The invention is described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Moreover, those skilled in the art will appreciate that the invention may be practiced with other computer system configurations, including hand-held devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, minicomputers, mainframe computers, and the like. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
With reference to
Computer 110 typically includes a variety of computer readable media. By way of example, and not limitation, computer readable media may comprise computer storage media and communication media. The system memory 130 includes computer storage media in the form of volatile and/or nonvolatile memory such as read only memory (ROM) 131 and random access memory (RAM) 132. A basic input/output system 133 (BIOS), containing the basic routines that help to transfer information between elements within computer 110, such as during start-up, is typically stored in ROM 131. RAM 132 typically contains data and/or program modules that are immediately accessible to and/or presently being operated on by processing unit 120. By way of example, and not limitation,
The computer 110 may also include other removable/nonremovable, volatile/nonvolatile computer storage media. By way of example only,
The drives and their associated computer storage media discussed above and illustrated in
The computer 110 in the present invention will operate in a networked environment using logical connections to one or more remote computers, such as a remote computer 180. The remote computer 180 may be a personal computer, and typically includes many or all of the elements described above relative to the computer 110, although only a memory storage device 181 has been illustrated in
When used in a LAN networking environment, the computer 110 is connected to the LAN 171 through a network interface or adapter 170. When used in a WAN networking environment, the computer 110 typically includes a modem 172 or other means for establishing communications over the WAN 173, such as the Internet. The modem 172, which may be internal or external, may be connected to the system bus 121 via the user input interface 160, or other appropriate mechanism. In a networked environment, program modules depicted relative to the computer 110, or portions thereof, may be stored in the remote memory storage device. By way of example, and not limitation,
Although many other internal components of the computer 110 are not shown, those of ordinary skill in the art will appreciate that such components and the interconnection are well known. Accordingly, additional details concerning the internal construction of the computer 110 need not be disclosed in connection with the present invention.
III. Systems and Methods of the Invention
As set forth above,
The method continues in step 302, wherein the user selects to publish the document. The user may elect to publish the document, for example, using a user-selectable option provided by the native application. For example, if the document has been composed in Word, the user may select “File” from the toolbar, select “Print” from the drop-down box, and then select “Print to Fixed Format.” Other selectable options provided by Word and other native applications are possible. The native application implements the selectable options using the API 204.
In step 304, the document is published by the native application and/or the viewer. Publishing the document includes, for example, creating a new “published document” by adding a layer of formatting to the original document, as specified by the API 204. The published document is a fixed file, which may not be edited or altered. Furthermore, the published document has a particular fixed-file content type, and the published document can be recognized as having the particular fixed-file content type. In addition, all software code present in the original document has been removed or disabled such that the published document does not contain any executable code.
Because the published document cannot include code, viruses, or other potential hazards, there is no threat to the user's computer system when a published document is opened. Thus, there is no need to present the user with dialog boxes warning about potential hazards. This increases user comfort with the viewer and renders the viewer easier to use.
In step 306, the user may elect to transmit the published document via a network or some other means, or to save the published document to external storage or local storage. The option to transmit or save the published document may be presented to the user, for example, via a dialog box.
In step 403, it is determined that the published document is of a particular format or content type. In one implementation, the API determines that the published document is of a particular format or content type based on a file extension or other relevant information.
In step 404, the viewer is invoked, for example, by the API. In step 406, the web browser may be invoked, for example, either by the API or by the viewer. In step 408, the web browser opens a window or otherwise provides a host environment for the published document. In step 410, the viewer displays the published document to the user in the host environment provided by the web browser. Because the document cannot contain executable code, there is no need to present the user with dialog boxes warning about viruses or other potential hazards.
While particular embodiments of the invention have been illustrated and described in detail herein, it should be understood that various changes and modifications might be made to the invention without departing from the scope and intent of the invention. The embodiments described herein are intended in all respects to be illustrative rather than restrictive. Alternate embodiments will become apparent to those skilled in the art to which the present invention pertains without departing from its scope.
From the foregoing it will be seen that this invention is one well adapted to attain all the ends and objects set forth above, together with other advantages, which are obvious and inherent to the system and method. It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other features and sub-combinations. This is contemplated and within the scope of the appended claims.
