Patent ID: 7639805

Claim:
A process for managing digital rights to a scalable media file comprising of truncatable media packets, wherein a different encryption/decryption key is used to encrypt each truncatable media packet having a base layer and an enhancement layer without requiring additional storage space to store the encryption/decryption key, comprising the process actions of: using a first computing device for encryption; receiving at the first computing device a scalable media file comprising a plurality of truncatable media packets; for each truncatable media packet: deriving a packet key for the encryption/decryption of the truncatable media packet via a message authentication code (MAC) on the base layer of the truncatable media packet; encrypting the base layer and the enhancement layer of the media packet using the packet key; encrypting the packet key via a media encryption key authorized by an owner of the content of the media; replacing an equal portion of the content in the encrypted base layer of the truncatable media packet with the encrypted packet key; using the first computing device or a second computing device for decryption of each truncatable media packet; receiving at the first computing device or second computing device the truncatable media packets; decrypting the packet key from the replaced portion of the encrypted base layer using a media decryption key authorized by the owner of the content of the media; decrypting the portion of the base layer of the truncatable media packet not replaced by the encrypted packet key using the decrypted packet key; using the MAC on the base layer of the decrypted portion of the truncatable media packet to regenerate the content overwritten by the encrypted packet key to reconstruct the entire base layer of the media packet; and decrypting the content of the enhancement layer of the truncatable media packet using the decrypted packet key.