Patent ID: 7624282
Filing Date: 2009-11-24
Classification: G11B

Abstract:
1. A method of copy protecting content data on a consumer CD or DVD optical disk suitable for playing on a typical player, the content data being organized in a plurality of sectors, comprising the acts of: inserting predetermined data patterns into selected ones of the sectors, the data patterns including, when played back, repeated patterns of values; applying content scrambling system (CSS) encryption to each of the selected sectors; and providing the content data including the selected CSS encrypted sectors, the remaining sectors, and at least one key associated with CSS decryption of the selected sectors wherein the predetermined data patterns are each hidden by the CSS encryption; writing the provided data to an optical disk master; and making a plurality of consumer CD or DVD optical disks from the optical disk master, wherein on the consumer CD or DVD optical disks, the predetermined data patterns are each hidden by the CSS encryption and decrypted in the typical player upon play of the consumer CD or DVD; wherein the predetermined data patterns are Digital Sum Value (DSV) data patterns, there being a plurality of the DSV data patterns on each optical disk, each of the plurality of DSV data patterns being 2 to 20 bytes in length and there being 1,000 to 5,000 bytes of DSV data patterns for each 32 of the plurality of the sectors.