Content protection interoperability infrastructure

• US 8,296,569 B2
• Filed: 10/09/2006
• Issued: 10/23/2012
• Est. Priority Date: 10/09/2006
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Pestoni, Florian
• Primary Examiner(s): Arani, Taghi
• Assistant Examiner(s): CHANG, KENNETH W
• Application Number:
  US11/539,840
• Publication Number:
  US 20080086757A1
• Time in Patent Office: 2,206 Days
• Field of Search: 713/172
• US Class Current: 713/172
• CPC Class Codes: G06F 21/1063 Personalisation
• CPC Class Codes: H04N 21/23473 by pre-encrypting
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/472 End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content end-user interfaces for retrieving video data from a database G06F16/739; network services for supporting unicast streaming H04L65/612
• CPC Class Codes: H04N 21/8193 dedicated tools, e.g. video decoder software or IPMP tool
• CPC Class Codes: H04N 21/83555 using a structured language for describing usage rules of the content, e.g. REL
• CPC Class Codes: H04N 21/84 Generation or processing of descriptive data, e.g. content descriptors systems specially adapted for using meta-information in broadcast systems H04H60/73

Abstract

Interoperability of protected content items between computing devices is facilitated by providing content items having a standard representation, and media players having support for the content item representations. The representation of the content item may be limited by a profile as to the elements it contains. The elements allowed in the content item may also be limited.

Claims

1. A method of generating a protected content item for processing by a plurality of computing devices, said method comprising:

defining, in a license, one or more operations that a computing device is authorized to perform on a resource;

defining, corresponding to the license, a first content protection scheme and a second content protection scheme for permitting the defined one or more operations on the resource and for preventing other operations on the resource, wherein the second content protection scheme is different from the first content protection scheme;

generating a first encrypted resource by encoding the resource as a function of the first content protection scheme and generating a second encrypted resource by encoding the resource as a function of the second content protection scheme;

providing the license in a descriptor;

identifying the first content protection scheme and the second content protection scheme in the descriptor; and

specifying a digital item description in the descriptor, said digital item description relating;

the first content protection scheme and the license to the first protected resource; and

the second content protection scheme and the license to the second protected resource;

defining a profile for generating a protected content item, said profile including a restricted set of elements to be contained in the protected content item relative to the set of elements available in a content item format associated with the protected content item; and

generating the protected content item as a single schema container for transfer to one or more of the plurality of computing devices, said schema container containing the first encrypted resource as a first item, the second encrypted resource as a second item, and the descriptor as a schema document, wherein the license is applicable for permitting rendering of the first encrypted resource and rendering of the second encrypted resource.

2. The method of claim 1 wherein identifying the first content protection scheme comprises storing an identifier representative of the first content protection scheme in the descriptor.

3. The method of claim 1 wherein identifying the first content protection scheme comprises storing a reference to a source providing the first content protection scheme.

4. The method of claim 1 wherein the profile comprises the descriptor, and wherein the descriptor comprises:

exactly one list of tools having a tool description, said tool description comprising either a tool identification or a reference to a source defining the tool; and

exactly one collection of licenses having a description of rights, said description of rights being limited to either a license definition or a reference to a source defining a license.

5. The method of claim 4 wherein the profile allows signatures only for the descriptor and the digital item description.

6. A computer readable memory having stored thereon a schema container representing a single protected content item having a first protected resource and a second protected resource, wherein the single protected content item is compatible with a plurality of rendering devices, said schema container comprising:

a content item type for identifying a content item format of the content item;

a metadata portion implemented as a schema document for;

identifying a license associated with the first protected resource and the second protected resource of the protected content item, said license specifying operations that the plurality of rendering devices are authorized to perform on the protected content item;

identifying a first content protection scheme and a second content protection scheme for permitting operations authorized by the license and for preventing operations not authorized by the license, wherein the second content protection scheme is different from the first content protection scheme;

relating the first content protection scheme and the license to the first protected resource;

relating the second content protection scheme and the license to the second protected resource; and

identifying a first location of the first protected resource and a second location of the second protected resource; and

a data portion for containing the first protected resource and the second protected resource, said first protected resource comprising the protected content item encrypted as a function of the first content protection scheme and the second protected resource comprising the protected content item encrypted as a function of the second content protection scheme identified in the metadata portion, wherein the protected content item has one or more elements that are restricted as a function of a profile, said profile defining a restricted set of elements to be contained in the protected content item relative to a set of elements available for the content item format associated with the protected content item.

7. The computer readable memory of claim 6 wherein the metadata portion identifies the first content protection scheme by storing at least one of the following:

an identifier representative of the first content protection scheme and a reference to a source defining the first content protection scheme.

8. The computer readable memory of claim 6 wherein said restricted set of elements is selected to enable compatibility of the protected content item with the plurality of rendering devices.

9. The computer readable memory of claim 8 wherein the profile comprises a descriptor comprising:

exactly one list of tools having a tool description, said tool description comprising either a tool identification or a reference to a source defining the tool; and

exactly one collection of licenses having a description of rights, said description of rights being limited to either a license definition or a reference to a source defining a license.

10. The computer readable memory of claim 9 wherein the profile allows signatures only for the descriptor and the digital item description.

11. The computer readable memory of claim 6 wherein the protected content item comprises digital media content.

12. A method of processing a protected content item, said protected content item implemented as a single schema container, said schema container comprising a protected representation of a media content at a media player, said protected content item having a schema document storing a descriptor, a first protected resource representative of the media content, and a second protected resource different from the first protected resource and representative of the media content, said descriptor identifying a license associated therewith for permitting rendering of the first protected resource and the second protected resource, said descriptor relating the license and the first protection scheme to the first protected resource, said descriptor further relating the license and the second protection scheme to the second protected resource, said method comprising:

determining, from the descriptor, the license and a content protection scheme corresponding to each of the first protected resource and the second protected resource;

determining, from the license identified in the descriptor, one or more operations that the media player is authorized to perform on the media content;

selecting one of the first protected resource and the second protected resource as a function of the authorized operations and further as a function of compatibility of the media player with the determined content protection scheme of either the first protected resource or the second protected resource, or both; and

permitting an operation on the selected protected resource, wherein said permitting comprises;

decrypting the selected protected resource as a function of the determined content protection scheme of the selected protected resource; and

generating a bitstream from the decrypted selected protected resource, said bitstream comprising an unprotected representation of the media content.

13. The method of claim 12 further comprising acquiring support for the determined content protection scheme of the selected protected resource at a time other than when the media content is queued for rendering.