System and method for authorized compression of digitized music
First Claim
1. 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:
- means for processing at least one segment of the music to obtain a test digital signature by applying a cryptographic hash solely to the segment without applying a user identification;
means for receiving an authorized digital signature associated with the music; and
means for permitting compression and recording of the music only if at least the test digital signature matches the authorized digital signature.
2 Assignments
0 Petitions
Accused Products
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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Citations
13 Claims
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1. 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:
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means for processing at least one segment of the music to obtain a test digital signature by applying a cryptographic hash solely to the segment without applying a user identification; means for receiving an authorized digital signature associated with the music; and means for permitting compression and recording of the music only if at least the test digital signature matches the authorized digital signature. - View Dependent Claims (2)
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3. 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:
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recording the music on the disk along with at least one authorized digital signature derived solely by applying a cryptographic hash to the music without recording a user identification on the disk; 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. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A computer program storage device including a program of computer readable instructions for determining whether a request to compress and record digitized music should be honored, the program of instructions undertaking method acts comprising:
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processing at least one segment of the music and only the segment to obtain a test digital signature; receiving an authorized digital signature associated with the music; and permitting compression and recording of the music only if at least the test digital signature matches the authorized digital signature. - View Dependent Claims (11)
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12. A method for facilitating die compression and storage, on a personal music player, of digitized music received on a disk in an authorized transaction, comprising the acts of:
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engaging the disk with a personal music player compression device; deriving at least one test digital signature solely from the music; and compressing the music and recording the music on the personal music player only if the at least one rest digital signature matches at least one digital signature received on the disk without checking for a user identification. - View Dependent Claims (13)
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Specification