Patent ID: 7007170

Claim:
A system for securely playing a content stream, comprising: (a) a processor that is arranged to perform actions, including: (1) selectively encrypting at least a portion of the content stream using a content key; (2) encrypting the content key using a screener key; and (3) encrypting the screener key using a public key; and (b) a player that is arranged to receive the selectively encrypted content stream and encrypted screener key, and to perform actions, including: (1) decrypting the encrypted screener key using a private key associated with the public key, wherein the public key and the private key are bound to the player such that the public key and the private key are unique to the player; (2) decrypting the encrypted content key using the screener key; and (3) decrypting the selectively encrypted content stream using the content key.