SECURE EXTENSIBLE COMPUTING ENVIRONMENT

摘要

A method of downloading encrypted e-content to a terminal device (12) includes receiving a request for encrypted content from a terminal device (12). A content server (18) generates a private symmetric key and encrypts the e-content with the symmetric key . A key server (16) looks up the terminal device (12) public key in a key repository and sends the symmetric key encrypted with the public key of the terminal device (12) to the content server (18). The key server (16) generates a unique license i.d. and produces an entry in a license repository. The content server (16) sends a response to the terminal device (12) including the content encrypted with the symmetric key. Transfer tickets and challenges received from the content server (18) are used to activate the e-content license. Additionally, trading of e-content licenses between users, activation of an e-content license transferred from a giver's terminal device (12) to a borrower's terminal device (12) are also supported. For viewing secure content on a personal computer a secure extensible computing environment is implemented on a personal computer peripheral card while processing of the content is performed in encrypted form in the computer. The content is delivered in encrypted form to the secure extensible computing environment on the personal computer peripheral card and decrypted therein.