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:
Jul. 29, 1997
Filed:
Sep. 27, 1994
Donald D Williams, Boca Raton, FL (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Multiple applications or versions of an application in different languages are distributed on a single mass storage medium, such as a CD-ROM. The BIOS is programmed to emulate different drives individually or simultaneously with data read from prescribed regions of the CD-ROM. To prevent access to unauthorized emulated images, each image is provided with an encryption key used as the seed to a pseudorandom number generator. Pseudorandom decryption of each block of data read from the CD-ROM is performed at the BIOS level only or at both the BIOS and application levels. For enhanced security, the algorithm decrypts each block of encrypted image data at a starting index that is pseudorandomly derived.