Copy protection for recorded media
First Claim
1. A method of securely transferring a disk key and a media key, from a media storage to an output device in a computer system, the output device having an output device key associated therewith, said method comprising the steps of:
- generating a first random secure transfer key with a uniqueness factor derived from phase lock loop circuitry;
forming a second secure transfer key by combining the secure transfer first key with the output device key;
forming a third secure transfer key by using the second secure transfer key to encrypt the disk key and the media key; and
transferring the third secure transfer key to the output device.
4 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for securely transferring an encrypted-data key and a medium key, from a media storage such as a DVD disk to an output device in a computer system, using a randomly generated first secure transfer key generated by a disk drive of the computer system, the first key having a uniqueness factor derived from a phase locked loop circuitry. The first secure transfer key is combined with an output key stored in the output device forming a second secure transfer key. The second secure transfer key is used to encrypt the data key and the medium key to form a third secure transfer key. The third secure transfer key is passed to the output device where the data key and the medium key are decrypted. The data key and the medium key are then used by the output device to decrypt encrypted program data from the disk.
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Citations
16 Claims
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1. A method of securely transferring a disk key and a media key, from a media storage to an output device in a computer system, the output device having an output device key associated therewith, said method comprising the steps of:
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generating a first random secure transfer key with a uniqueness factor derived from phase lock loop circuitry; forming a second secure transfer key by combining the secure transfer first key with the output device key; forming a third secure transfer key by using the second secure transfer key to encrypt the disk key and the media key; and transferring the third secure transfer key to the output device. - View Dependent Claims (2, 3, 4, 5)
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6. The method as recited in claim 6, wherein the disk drive is a digital versatile disk drive.
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7. A method of providing copy protection during the transfer of a media key and a disk key of a previously recorded disk containing encrypted data, from the disk to an output controller of a playback device, the output controller having an output controller key associated therewith, said method comprising the steps of:
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generating a first random secure transfer key in the playback device with a uniqueness factor derived from phase lock loop circuitry; forming a second secure transfer key by combining the first secure transfer key with the output controller key; forming a third transfer key by using the second secure transfer key to encrypt the media key and the disk key; and transferring the third secure transfer key to the output controller. - View Dependent Claims (8, 9, 10, 11)
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12. A copy protection apparatus comprising:
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a data storage medium having encrypted data stored thereon, said encrypted data having a data key associated therewith, said data key stored on said data storage medium, said data storage medium includes a data storage medium key associated therewith; a playback device including a media access device and an output device, said media access device accessing the encrypted data stored on said data storage medium and accessing said data key and said data storage medium key; said output device having a output device key associated therewith; means for generating a first secure random transfer key with a uniqueness factor derived from phase lock loop circuitry; means for generating a second secure transfer key by combining said first secure transfer key with said output device key; and means for generating a third secure transfer key by using said second secure transfer key to encrypt said data storage medium key and said data key; wherein subsequent to said third key being generated, said third key is transferred to said output device whereupon said data key and said data storage medium key are decrypted. - View Dependent Claims (13, 14, 15, 16)
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Specification