Importance

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Abstract

A method of access control in which an authority may limit the content a client may download to a trusted device comprises: the authority making content, and a content descriptor containing information about the content, available to a client; the authority providing an access key to a client; the client presenting the access key and a requested content descriptor to a trusted device for download; and the trusted device accepting or rejecting the requested download as determined by the access key and content descriptor presented. Numerous variations are possible. Apparatus for limiting distribution of content obtained together with an access key in which a shared secret is encoded from a computer executing a server process comprises: a trusted device including a verifier that verifies the encoded shared secret and a content acceptor that only accepts content when the shared secret is verified. The access key may include a message digest covering the shared secret in which case the trusted device may further comprise: a message digest encoded into which information including the shared secret is fed and which produces a message digest for comparison the access key.

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First Claim