Patent ID: 8782419
Filing Date: 2014-07-15
Classification: G06F

Abstract:
1. An apparatus for storing a backup version of a digital rights object bound to an originating device and related to a digital media content, the apparatus comprising: a parser which is adapted to acquire first information of the digital rights object, the first information not being critical for a usage of the digital media content, and to acquire second information of the digital rights object, the second information being critical for the usage of the digital media content, wherein the parser is adapted to acquire a rights encryption key of the digital rights object as at least a part of the second information, wherein the rights encryption key is used to encrypt/decrypt a content encryption key related to the digital media content; an encrypter for encrypting the second information using a secret of the originating device to acquire encrypted second information, wherein the encrypter is adapted to encrypt the acquired rights encryption key with a backup encryption key, wherein the backup encryption key is the secret of the originating device, wherein the backup encryption key is a cryptographic key for a symmetric key-algorithm, wherein the backup encryption key is based on a further secret of the originating device and at least the first information, and wherein the first information is different for different backup rights objects; a signature generator being adapted to generate a signature of the originating device over at least the first information of the digital rights object; and a recorder which is adapted to store the first information in a way such that the first information is readable by at least a second device, to store the encrypted second information such that the encrypted second information is not readable by at least the second device, and to store the signature, such that the backup rights object comprises the stored first information, the encrypted second information and the signature.