Patent ID: 7536355

Claim:
A method for securing a content, comprising the steps of: (A) receiving said content at a recorder from a source; (B) receiving a class key at said recorder from an owner of said content; (C) reading a media key block and a media identification value of a medium with said recorder, said media key block containing a set of encrypted keys; (D) generating a first media key with said recorder by decrypting at least one encrypted key from said set of encrypted keys in said media key block based on a device key, wherein said device key is unique to a particular player of a plurality of players; (E) assigning a second media key to one of a plurality of subscriber classes with said recorder by applying a decryption cipher to said first media key using said class key; (F) generating an encrypted title key with said recorder by encrypting a title key based on both said second media key and said media identification value; (G) generating an encrypted content with said recorder by encrypting said content based on said title key; and (H) writing said encrypted content and said encrypted title key in said medium with said recorder.