摘要:
Provided are techniques for the creation and storage of an archive for binding IDs corresponding to a cluster of devices that render content protected by a broadcast encryption scheme. When two or more clusters are merged, a binding ID corresponding to one of the clusters is selected and a new management key is generated. Binding IDs associated with the clusters other than the cluster associated with the selected binding ID are encrypted using the new management key and stored on a cluster-authorized device in a binding ID archive. Content stored in conformity with an outdated binding ID is retrieved by decrypting the binding ID archive with the management key, recalculating an old management key and decrypting the stored content.
摘要:
In one aspect of the invention is a method for discouraging unauthorized redistribution of protected content. Content is bound to a customer I.D. associated with a customer requesting the content, such that the customer I.D. is needed to access the content.
摘要:
A method and system for attaching a title key to encrypted content for synchronized transmission to, or storage by, a recipient is provided. Specifically, under the present invention, an elementary media stream is parceled into content units that each include a content packet and a header. The content packets are encrypted with one or more title keys. Once the content packets have been encrypted, the title keys are themselves encrypted with a key encrypting key. The encrypted title keys are then attached to the corresponding encrypted content packets for synchronized transmission to a recipient.
摘要:
A method for verifying the integrity of a media key block (MKB) by storing validation data in a validation area of a medium, such as a DVD-R or a DVD-RW. In one embodiment, validation data comprises a hash function on a media key block. In another embodiment, validation data comprises the Verification Data field of an MKB's Verify Media Key Record.
摘要:
A method for verifying the integrity of a media key block (MKB) by storing validation data in a validation area of a medium, such as a DVD-R or a DVD-RW. In one embodiment, validation data comprises a hash function on a media key block. In another embodiment, validation data comprises the Verification Data field of an MKB's Verify Media Key Record.
摘要:
A method of managing keys used by a digital content player on a computer system. According to the method, digital content data encrypted with a first encrypting key is decrypted using a first decrypting key, and re-encrypted using a second encrypting key. A second decrypting key is encrypted using a third encrypting key to produce an encrypted second decrypting key. In one preferred method, an encrypted first decrypting key that was encrypted using a fourth encrypting key is received, and the encrypted first decrypting key is decrypted using a fourth decrypting key to reproduce the first decrypting key. A digital content player for use on a computer system is also provided. The content player includes a decrypter that decrypts digital content data, which was encrypted with a first encrypting key, using a first decrypting key so as to produce the content data. An encrypter re-encrypts the content data using a second encrypting key and encrypts a second decrypting key using a third encrypting key. In one preferred content player, a receiver receives an encrypted first decrypting key that was encrypted using a fourth encrypting key, and the decrypter decrypts the encrypted first decrypting key using a fourth decrypting key to reproduce the first decrypting key.