The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2002
Filed:
Jan. 15, 1999
Applicant:
Inventor:
Antonius A. M. Staring, Eindhoven, NL;
Assignee:
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 2/000 ; G06F 1/214 ;
U.S. Cl.
CPC ...
G11B 2/000 ; G06F 1/214 ;
Abstract
A key is generated to control the access to information on an information carrier. The key is derived from an M-bit master key and an information carrier key. Apparatus to read and/or write information on an information carrier generates the M-bit master key. The information carrier key is derived from the information carrier. The M-bit master key is derived from only a part of an N-bit string, the part being determined by a number p derived from an identifier R associated with recording information on the information carrier.