Method and apparatus for digital content copy protection
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 23, 2004
Grant Date -
N/A
app pub date -
Jun 6, 2000
filing date -
Feb 25, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method, apparatus and a computer program product are described for copy protecting encrypted documents in a client-server system using an unsecured communication channel. The client-server system has clients and a server for storing encrypted documents. Encrypted documents e(K.sub.s, M) are received by a client from the server. Communications on a transmission channel between the client and the server are then authenticated. Such communications also include electronic payments initiated by a user using the client. Upon authenticating or payment, an encrypted document can then be decrypted. After decrypting, the unencrypted document is displayed but prevented from storage at any client unless re-encrypted using a host specific key K.sub.H associated with the client to thereby provide a re-encrypted document.
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