Method of distributing a decryption key in fixed-content data

摘要

Secondary content in encrypted for distribution to client terminals by selecting at least a portion of raw encrypted audio-video data (REAVD) that is provided on a media article as an encryption key, encrypting secondary content using the encryption key, and storing encrypted secondary content at a remotely located host. The media article can then be used for providing access to the encrypted secondary content to client terminals by receiving encrypted secondary content at a client terminal, extracting a decryption key from a media article encoded with REAVD, the decryption key being determined by at least a portion of the REAVD, using the decryption key to decrypt the secondary content, and outputting the decrypted secondary content from the client terminal.

主权项

1. A method comprising:
receiving encrypted content at a client terminal; extracting, by the client terminal, a decryption key that is no less than 128,000 bits in size from raw encrypted audio-video data (“REAVD”) encoded in a media article, the decryption key thereby including at least a portion of the REAVD encoding audio-video data; decrypting the encrypted content using the decryption key according to a defined decryption algorithm at the client terminal thereby providing decrypted content, wherein the REAVD excludes the encrypted content and the decryption algorithm includes one-to-one mapping between the encrypted content and the at least a portion of the REAVD; and storing the decrypted content in a computer memory.