05991399 is referenced by 506 patents and cites 3 patents.

Secure distribution of a private key to a user's application program (also called a "trusted player" such as a DVD player or CD-ROM player) with conditional access based on verification of the trusted player's integrity and authenticity is provided. Once validated, the trusted player uses the private key to decrypt encrypted digital content. The private key is dynamically generated, associated with specific digital content, and communicated in real-time from a server to the trusted player in a secure manner, thereby controlling access to encrypted digital content. The key is wrapped into an executable tamper resistant key module in which the key can only be used by the right trusted player as determined by the server based on user requests and payment. The key module plugs in to the trusted player and executes to validate the player and decrypt the content. The integrity of the trusted player is correlated to its ability to perform a cryptographic operation using an asymmetric key pair in a manner that is tamper resistant, thereby preventing an unencrypted copy of digital content to be made.

Title
Method for securely distributing a conditional use private key to a trusted entity on a remote system
Application Number
8/993597
Publication Number
5991399
Application Date
December 18, 1997
Publication Date
November 23, 1999
Inventor
Carlos V Rozas
Hillsboro
OR, US
Richard L Maliszewski
Forest Grove
OR, US
John Carbajal
Portland
OR, US
Gary L Graunke
Beaverton
OR, US
Agent
Steven P Skabrat
Assignee
Intel Corporation
CA, US
IPC
H04L 9/32
H04L 9/30
H04L 9/08
H04L 9/00
View Original Source