System and method for authorized compression of digitized music

Details System and method for authorized compression of digitized music System and method for authorized compression of digitized music

2006-07-25

2006-07-25

Trammell, James P. (Department: 3621)

Data processing: financial, business practice, management, or co

Business processing using cryptography

Usage protection of distributed data files

C705S052000, C705S053000, C705S054000, C705S057000, C705S058000, C380S028000, C380S046000, C380S054000, C380S269000, C713S157000, C713S176000

Reexamination Certificate

active

07082413

ABSTRACT:
A system and method for enabling authorized music from a CD or DVD to be compressed by a user for the user's own use, but to prevent the recompression of unauthorized music from, e.g., the Internet, includes hashing the music during recording with a cryptographic hash, and then signing the hash with a digital signature derived from the hash. Subsequent unauthorized compression and recompression will destroy the digital signature. Accordingly, music to be recorded is hashed to obtain a test digital signature and if, after hashing, the test digital signature matches the digital signature accompanying the music, compression and recording are allowed to proceed.

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