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. 28, 1998
Filed:
Nov. 07, 1996
Mark A Arps, Woodbury, MN (US);
Jon Blixt, Fremont, CA (US);
Imation Corp., Oakdale, MN (US);
Abstract
An optically-readable data disc includes piracy-protection featuring noncontiguously sequenced data files in zones separated by head-derailing barriers. The disc includes a plurality of data-placement zones and read-blocking barriers constructed along the spiral track over gaps which separate the zones. Data files are recorded in each of the zones, and an address-information data file includes data which identifies addresses of data files to be sequentially read in noncontiguous zones. By arranging the data files noncontiguously with barriers in gaps between the data files, efforts to duplicate the master disc by attempting to read the data files contiguously are deterred and/or prevented.