	US 7,603,563 B2
	Adaptable security mechanism for preventing unauthorized access of digital data
Steven T. Ansell, Fremont, Calif. (US); Andrew R. Cherenson, Los Altos, Calif. (US); Leon Rishniw, Redwood City, Calif. (US); Susan A. Cannon, San Jose, Calif. (US); Edward J. Allard, San Francisco, Calif. (US); Jason S. Brownell, San Francisco, Calif. (US); and Micah Stroud, San Jose, Calif. (US)
Assigned to Microsoft Corporation, Redmond, Wash. (US)
Filed on Sep. 14, 2004, as Appl. No. 10/941,509.
Application 10/941509 is a continuation of application No. 09/468279, filed on Dec. 20, 1999, granted, now 6,792,113.
Prior Publication US 2005/0033974 A1, Feb. 10, 2005
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 21/00 (2006.01)

U.S. Cl. 713—182

12 Claims

1. In a system for securing content data, a method of securing multiple content data files using a passport data structure, the method comprising:

binding a first content data file to a first hardware device using a first binding key related to the first hardware device;

binding a second content data file to a second hardware device using a second binding key related to the second hardware device;

converting the first binding key and the second binding key to form cleartext keys independent of the hardware devices;

adding the cleartext keys to a user-bound passport such that the passport now contains multiple cleartext keys, the user-bound passport represented by the passport data structure.