US 9,071,423 B2Granted

Identification of a compromised content player

AssigneesSony Corporation, Sony Electronics Inc.

InventorBrant L. Candelore

Life of this patent

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Abstract

A system and method for identifying the player that leaked content encryption keys by loading a set of player keys into individual content players and determining the number of encryptions and the number of encryption keys to use in multiple encrypting critical content. The method produces copies of critical data content packets, each copy of which is separately encrypted using any one of a set of encryption keys that are related to one another through a mathematical algorithm. The related set of encryption keys and data describing key relationship and content player identity are transmitted to a previously determined license management agency. The transmitted encrypted content is written to a receiving device or file, or streamed to an individual player for non-synchronous playback. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

Claims14

Dependent claims

A non-transitory computer readable medium storing computer executable instructions that, when executed by a computing device, cause the computing device to perform operations of playing a physical media storage device in a media player, the media comprising audio, video, and/or multimedia content, the operations comprising:

retrieving a sub-title key from a hardware memory, the sub-title key formed from a title key and a Key Variant where the Key Variant is derived from a unique Device Key nibble and nibble value;
where the forming of the sub-title key uses the Key Variant and the title key encrypted using an encryption algorithm;
reading the media storage device to identify one or more content packets that are duplicated multiple encryption packets and which are decryptable by the retrieved sub-title key;
decrypting the one or more multiple encryption content packets by processing the multiple encryption content packets using an encryption algorithm which uses the sub-title key to unlock the multiple encryption content packets;
decrypting content packets identified as not multiple encryption content packets using an encryption algorithm which uses a title key to unlock the non-multiple encryption content packet;
where the decrypted content packets are assembled into an output stream clearly viewable on a display device attached to the media player, and where the sub-title key is a derivative of the title key;
and
where the media player is traced from a distributed set of sub-title keys by decrypting the title key using a Key Variant and discovering the nibble of the unique device key assigned to the media player.

5 more elements

A method of playing a physical media storage device in a media player, the media comprising audio, video, and/or multimedia content, the method comprising:

retrieving a sub-title key from a hardware memory, the sub-title key formed from a title key and a Key Variant where the Key Variant is derived from a unique Device Key nibble and nibble value;
where the forming of the sub-title key uses the Key Variant and the title key encrypted using an encryption algorithm;
reading the media storage device to identify one or more content packets that are duplicated multiple encryption packets and which are decryptable by the retrieved sub-title key;
decrypting the one or more multiple encryption content packets by processing the multiple encryption content packets using an encryption algorithm which uses the sub-title key to unlock the multiple encryption content packets;
decrypting content packets identified as not multiple encryption content packets using an encryption algorithm which uses a title key to unlock the non-multiple encryption content packet;
where the decrypted content packets are assembled into an output stream clearly viewable on a display device attached to the media player, and where the sub-title key is a derivative of the title key;
and
where the media player is traced from a distributed set of sub-title keys by decrypting the title key using a Key Variant and discovering the nibble of the unique device key assigned to the media player.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/593,938Filed 24 Aug 2012 · division
Priority: 20 Feb 2007
Published: US 2012/0321081 A120 Dec 2012
Granted: 30 Jun 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04L 9/083
Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely…:…
H04N 7/1675
Systems rendering the television signal unintelligible and subsequently intelligible: providing digital key or authorisation information for…
H04N 21/2585
Management of client data: generation of a revocation list, e.g. of client devices involved in piracy acts
H04N 21/26613
Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD…: for…

Family

Application60/902,541Us provisional application · filed 20 Feb 2007
Application11/895,199Parent of this division · filed 23 Aug 2007
US 2012/0321081 A1Pre-grant publication · published 20 Dec 2012
US 8,290,157 B2Parent of this division
US 2008/0199007 A1Published application
US 9,071,423 B2This patent

From the US filing history. Foreign family members aren’t listed.