Reprogrammable security for controlling piracy and enabling interactive content using revocation status
View Patent ↗Technologies are disclosed to transfer responsibility and control over security from player makers to content authors by enabling integration of security logic and content. An exemplary optical disc carries an encrypted digital video title combined with data processing operations that implement the title's security policies and decryption processes. Player devices include a processing environment (e.g., a real-time virtual machine), which plays content by interpreting its processing operations. Players also provide procedure calls to enable content code to load data from media, perform network communications, determine playback environment configurations, access secure nonvolatile storage, submit data to CODECs for output, and/or perform cryptographic operations. Content can insert forensic watermarks in decoded output for tracing pirate copies. If pirates compromise a player or title, future content can be mastered with security features that, for example, block the attack, revoke pirated media, or use native code to correct player vulnerabilities.
1. A method comprising:
receiving data that includes digital content and data processing instructions, the data processing instructions being specific to the digital content and being executable by a computer language interpreter of a playback device to affect playback of at least a portion of the digital content;
executing the data processing instructions by using the computer language interpreter of the playback device, the data processing instructions, when executed by the computer language interpreter, configuring the computer language interpreter to:
access a memory of the playback device, the memory storing a revocation status corresponding to the digital content and indicating that an authorization pertinent to the digital content is revoked; and
initiate a performance of an operation by the playback device based on the revocation status, the operation pertaining to the digital content and including enabling the playback of at least the portion of the digital content at a reduced resolution of the digital content, the reduced resolution being less than a maximum resolution of the digital content included in the received data.
2. The method of claim 1 , wherein:
the operation includes at least one of:
notifying a user of the playback device that the digital content is illegal;
enabling the user to initiate a purchase transaction related to the digital content; or
preventing playback of a further portion of the digital content.
3. The method of claim 1 , wherein:
the data processing instructions that are specific to the digital content are first data processing instructions; and
the memory of the playback device stores second data processing instructions executable by the computer language interpreter of the playback device to perform the operation pertaining to the digital content, the second data processing instructions corresponding to the revocation status and, when executed, configuring the playback device to perform the operation.
4. The method of claim 1 , wherein:
the data includes an identifier corresponding to the digital content;
the data processing instructions, in configuring the computer language interpreter to initiate the performance of the operation, configure the computer language interpreter to initiate the performance based on an authenticity of the identifier; and
the data processing instructions, when executed by the computer language interpreter, configure the computer language interpreter to determine the authenticity of the identifier.
5. The method of claim 4 , wherein:
the data processing instructions, when executed by the computer language interpreter, configure the computer language interpreter to access a digital signature of the identifier; and
the data processing instructions, in configuring the computer language interpreter to determine the authenticity of the identifier, configure the computer language interpreter to determine the authenticity based on the digital signature of the identifier.
6. The method of claim 1 , wherein the memory of the playback device is a nonvolatile memory.
7. The method of claim 1 further comprising:
receiving the revocation status of the digital content; and
storing the revocation status in the memory of the playback device.
8. The method of claim 7 , further comprising:
accessing a digital signature of the revocation status; and
determining that the revocation status is authentic based on the digital signature of the revocation status; and wherein the storing of the revocation status is responsive to the determining that the revocation status is authentic.
9. The method of claim 1 , wherein the receiving of the data includes receiving at least some of the data from a media drive or via network.
10. A non-transitory machine-readable medium comprising:
digital content; and
data processing instructions specific to the digital content and executable by a computer language interpreter of a playback device to affect playback of at least a portion of the digital content, the data processing instructions, when executed by the computer language interpreter of the playback device, configuring the computer language interpreter to:
access a memory of the playback device, the memory storing a revocation status corresponding to the digital content and indicating that an authorization pertinent to the digital content is revoked; and
initiate a performance of an operation by the playback device based on the revocation status, the operation pertaining to the digital content and including enabling the playback of at least the portion of the digital content at a reduced resolution of the digital content, the reduced resolution being less than a maximum resolution of the digital content.
11. The non-transitory machine-readable medium of claim 10 , wherein:
the operation at least one of:
notifying a user of the playback device that the digital content is illegal;
enabling the user to initiate a purchase transaction related to the digital content; or
preventing playback of a further portion of the digital content.
12. The non-transitory machine-readable medium of claim 10 , wherein
the data processing instructions that are specific to the digital content are first data processing instructions and, in configuring the computer language interpreter to access the memory of the playback device, configure the computer language interpreter to access second data processing instructions that are stored in the memory and executable by the computer language interpreter of the playback device to perform the operation pertaining to the digital content, the second data processing instructions corresponding to the revocation status and, when executed, configuring the playback device to perform the operation.
13. The non-transitory machine-readable medium of claim 10 further comprising
an identifier corresponding to the digital content; and wherein:
the data processing instructions, in configuring the computer language interpreter to initiate the performance of the operation, configure the computer language interpreter to initiate the performance based on an authenticity of the identifier;
and the data processing instructions, when executed by the computer language interpreter, configure the computer language interpreter to determine the authenticity of the identifier.
14. The non-transitory machine-readable medium of claim 13 further comprising:
a digital signature of the identifier; and wherein
the data processing instructions, when executed by the computer language interpreter, configure the computer language interpreter to access the digital signature of the identifier; and
the data processing instructions, in configuring the computer language interpreter to determine the authenticity of the identifier, configure the computer language interpreter to determine the authenticity based on the digital signature of the identifier.
15. The non-transitory machine-readable medium of claim 13 , wherein:
the identifier is a serial number of the non-transitory machine-readable medium.
16. The non-transitory machine-readable medium of claim 10 , wherein
the data processing instructions, when executed by the computer language interpreter, configure the computer language interpreter to:
access a digital signature of the revocation status; and
determine that the revocation status is authentic, based on the digital signature of the revocation status.
17. The non-transitory machine-readable medium of claim 10 , wherein:
the data processing instructions, when executed by the computer language interpreter, configure the computer language interpreter to receive an update of the revocation status via a network; and
the data processing instructions, in configuring the computer language interpreter to initiate the performance of the operation, configure the computer language interpreter to initiate the performance based on the update of the revocation status.
18. An apparatus comprising:
a memory;
a computer language interpreter communicatively coupled to the memory; and
a media interface communicatively coupled to the computer language interpreter, the media interface being configured to receive data that includes digital content and data processing instructions, the data processing instructions being specific to the digital content and being executable by the computer language interpreter to affect playback of at least a portion of the digital content, the data processing instructions, when executed by the computer language interpreter, configuring the computer language interpreter to:
access a memory of the playback device, the memory storing a revocation status corresponding to the digital content and indicating whether that an authorization pertinent to the digital content is revoked; and
initiate a performance of an operation by the playback device based on the revocation status, the operation pertaining to the digital content and including enabling the playback of at least the portion of the digital content at a reduced resolution of the digital content, the reduced resolution being less than a maximum resolution of the digital content included in the received data.
19. A system comprising:
a nonvolatile memory;
means for receiving data that includes digital content and data processing instructions, the data processing instructions being specific to the digital content and being executable to affect playback of at least a portion of the digital content; and
means for executing the data processing instructions, the data processing instructions, when executed, causing:
access of the nonvolatile memory, the nonvolatile memory storing a revocation status corresponding to the digital content and indicating that an authorization pertinent to the digital content is revoked; and
initiation of an operation by the playback device based on the revocation status, the operation pertaining to the digital content and including enabling the playback of at least the portion of the digital content at a reduced resolution of the digital content, the reduced resolution being less than a maximum resolution of the digital content included in the received data.