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:
Jun. 28, 2005
Filed:
Jan. 15, 1998
Lauren Ann Christopher, Indianapolis, IN (US);
Max Artigalas, Rennes Cedex, FR;
Friedrich Rominger, Brigachtal, DE;
Juergen Vogel, Brigachtal, DE;
Alexander Kravtchenko, Villingen-Schwenningen, DE;
Lauren Ann Christopher, Indianapolis, IN (US);
Max Artigalas, Rennes Cedex, FR;
Friedrich Rominger, Brigachtal, DE;
Juergen Vogel, Brigachtal, DE;
Alexander Kravtchenko, Villingen-Schwenningen, DE;
Digital Video Express, L.P., Herndon, VA (US);
Abstract
A method and apparatus for preventing unauthorized use of DVDs on a DVD ROM drive. The method comprises a DVD disc that includes special data processing. When the DVD is replayed on a standard DVD ROM drive the invention causes the output of the DVD ROM drive to be erroneous, such that the computer cannot use the data. According to the invention, when encoding a disc, the error correction and/or error detection bits, check bytes, are moved into the normal or main data area. When this scrambled data is output from a standard DVD ROM drive, the data in the check byte area is lost and the information is not useable. For authorized use, this scrambling is reversed before sending video and/or audio data to the MPED decoder and AC-3 decoder respectively.