Patent Number: 6,167,136

Title: Method for preventing copying of digital video disks

Abstract: A method for securely storing analog or digital data on a data storage medium. An analog information signal is combined with a noise signal. The composite noise and information signal is encrypted with a key which is derived from the noise signal. The encrypted composite signal is compressed and then recorded on the data storage medium along with an encrypted value of the key. The storage medium data is read, decompressed, and decrypted using a decryption key derived from the stored encrypted key. The data is then converted to an analog signal and combined with a noise correction signal derived from said key to eliminate the noise signal added to the analog information signal before storing the signal on the data storage medium.

Inventors: Chou; Wayne W. (Ridgefield, CT)

Assignee: Software Security, Inc.

International Classification: G11B 20/00 (20060101); H04N 5/913 (20060101); H04N 5/84 (20060101); H04N 5/85 (20060101); H04L 009/00 ()

Expiration Date: 12/26/2017