A method and apparatus for protecting digital content. A secure digital
appliance is disclosed for receiving communications coupled over a
communication network. A private key of a private key and public key pair
is stored in the secure digital appliance in such a way that the stored
private key cannot be obtained by tampering with the secure digital
appliance. Upon receipt of a session initiation message that is encrypted
using the public key (of the private key and public key pair) the secure
digital appliance decrypts the session initiation message using the
stored private key to obtain a session key. The session key is then used
to decrypt communications that include encrypted digital content. The
secure digital appliance includes a local output device (e.g., a TV
screen and/or speakers) that is operable to provide protected output of
the digital content. The secure digital appliance does not contain any
provision for output other than the protected output of digital content.
Because the secure digital appliance does not allow for any output of the
digital content other than the protected output, the end user cannot
obtain a high quality digital copy of the digital content. Therefore,
there is little chance that the security of digital content will be
compromised.