Content security layer providing long-term renewable security
View Patent ↗In an exemplary embodiment, digital content is mastered as a combination of encrypted data and data processing operations that enable use in approved playback environments. Player devices having a processing environment compatible with the content's data processing operations are able to decrypt and play the content. Players can also provide content with basic functions, such as loading data from media, performing network communications, determining playback environment configuration, controlling decryption/playback, and/or performing cryptographic operations using the player's keys. These functions allow the content to implement and enforce its own security policies. If pirates compromise individual players or content titles, new content can be mastered with new security features that block the old attacks. A selective decryption capability can also be provided, enabling on-the-fly watermark insertion so that attacks can be traced back to a particular player. Features to enable migration from legacy formats are also provided.
1. A method for mastering digital content for secure playback on a player, the method comprising:
using a processor to generate a plurality of versions of the digital content, each version of the plurality of versions being encrypted using a different encryption key;
using a processor to generate executable instructions for execution on the player, the executable instructions being configured to:
query a playback environment of the player to obtain player data,
receive cryptographic data of the player,
decode at least one version of the plurality of versions of the digital content by using the player data and the cryptographic data to generate decoded content, and
embed a watermark into the decoded content, the watermark including at least a portion of the player data; and
combining the plurality of versions of the digital content and the executable instructions for distribution to consumers.
2. The method of claim 1 including:
recovering decoded content produced by a particular player; and
analyzing the watermark in the recovered decoded content to identify the particular player used to produce the recovered decoded content.
3. The method of claim 1 wherein the player data includes information uniquely identifying a particular player.
4. The method of claim 1 wherein the executable instructions being further configured to determine if a particular player is an authorized player.
5. The method of claim 1 wherein the executable instructions being further configured to prevent playback of the decoded content on an unauthorized player.
6. The method of claim 1 wherein the cryptographic data includes at least one decryption key.
7. The method of claim 1 wherein the cryptographic data includes at least one decryption key and the executable instructions being further configured to use the decryption key to decode the at least one version of the plurality of versions of the digital content.
8. The method of claim 1 wherein the cryptographic data includes at least one decryption key, the at least one decryption key being useable for decoding only one version of the plurality of versions of the digital content.
9. The method of claim 1 wherein the cryptographic data of the player is received from a device external to the player.
10. An apparatus for mastering digital content for secure playback on a player, the apparatus comprising:
a processor;
a content generator executable by the processor to generate a plurality of versions of the digital content, each version of the plurality of versions being encrypted by using a different encryption key;
an instruction generator executable by the processor to generate executable instructions for execution on the player, the executable instructions being configured to:
query a playback environment of the player to obtain player data, receive cryptographic data of the player,
decode at least one version of the plurality of versions of the digital content by using the player data and the cryptographic data to generate decoded content, and
embed a watermark into the decoded content, the watermark including at least a portion of the player data; and
a distribution content generator to combine the plurality of versions of the digital content and the executable instructions for distribution to consumers.
11. The apparatus of claim 10 being further configured to:
recover decoded content produced by a particular player; and
analyze the watermark in the recovered decoded content to identify the particular player used to produce the recovered decoded content.
12. The apparatus of claim 10 wherein the player data includes information uniquely identifying a particular player.
13. The apparatus of claim 10 wherein the executable instructions being further configured to determine if a particular player is an authorized player.
14. The apparatus of claim 10 wherein the executable instructions being further configured to prevent playback of the decoded content on an unauthorized player.
15. The apparatus of claim 10 wherein the cryptographic data includes at least one decryption key.
16. The apparatus of claim 10 wherein the cryptographic data includes at least one decryption key and the executable instructions being further configured to use the decryption key to decode the at least one version of the plurality of versions of the digital content.
17. The apparatus of claim 10 wherein the cryptographic data includes at least one decryption key, the at least one decryption key being useable to decode only one version of the plurality of versions of the digital content.
18. The apparatus of claim 10 wherein the cryptographic data of the player is received from a device external to the player.
19. A machine-readable storage medium embodying instructions which, when executed by a machine, cause the machine to:
generate a plurality of versions of digital content, each version of the plurality of versions being encrypted by using a different encryption key;
generate executable instructions for execution on a player, the executable instructions being configured to:
query a playback environment of the player to obtain player data,
receive cryptographic data of the player,
decode at least one version of the plurality of versions of the digital content by using the player data and the cryptographic data to generate decoded content, and
embed a watermark into the decoded content, the watermark including at least a portion of the player data; and
combine the plurality of versions of the digital content and the executable instructions for distribution to consumers.
20. The machine-readable storage medium of claim 19 being further configured to:
recover decoded content produced by a particular player; and
analyze the watermark in the recovered decoded content to identify the particular player used to produce the recovered decoded content.
21. The machine-readable storage medium of claim 19 wherein the player data includes information uniquely identifying a particular player.
22. The machine-readable storage medium of claim 19 wherein the executable instructions being further configured to determine if a particular player is an authorized player.
23. The machine-readable storage medium of claim 19 wherein the cryptographic data includes at least one decryption key, the at least one decryption key being useable to decode only one version of the plurality of versions of the digital content.