System and method for authorized compression of digitized music
AssigneeInternational Business Machines Corporation
InventorsALAN EDWARD BELL, JEFFREY BRUCE LOTSPIECH
Life of this patent
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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.
Claims20
A computer-based system for inhibiting unauthorized recording of digitized music, comprising:
- a cryptography module including logic executable by a provider computer, the logic including, for at least a segment of the music, obtaining an authorized digital signature, and then associating the authorized digital signature with the music;
- and
- a consumer module associated with a consumer music player and executable thereby to undertake logic including processing at least the segment of the music to obtain a test digital signature, and, only if the test digital signature matches the authorized digital signature, permitting at least one of:
- compression of the music, and recording the music, on the consumer music player:
A computer program storage device including a program of instructions for determining whether a request to compress and record digitized music should be honored, the program of instructions including:
- computer readable code means for processing at least one segment of the music to obtain a test digital signature;
- computer readable code means for receiving an authorized digital signature associated with the music;
- and
- computer readable code means for permitting compression and recording of the music only if at least the test digital signature matches the authorized digital signature.
A computer program storage device including a program of instructions for associating digitized music with at least digital signature derived from at least a segment of the music, the program of instructions including structure comprising:
- computer readable code means for deriving an authorized digital signature from at least the segment of the music;
- computer readable code means for storing the music on a recording medium;
- and
- computer readable code means for storing the authorized digital signature on the recording medium along with the music.
A method for facilitating the compression and storage, on a personal music player, of digitized music received on a disk in an authorized transaction, comprising the acts of:
- recording the music on the disk along with at least one authorized digital signature derived from the music;
- receiving the disk;
- engaging the disk with a personal music player compression device;
- deriving at least one test digital signature from the music;
- and
- compressing the music and recording the music on the personal music player only if the test digital signature matches the authorized digital signature.
Dependencies are inferred from the claim text.