Disc serialization

• US 5,572,589 A
• Filed: 12/09/1993
• Issued: 11/05/1996
• Est. Priority Date: 12/09/1993
• Status: Expired due to Term

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Lazarus, Jonathan D., Waters, Lester L.
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US08/165,241
• Time in Patent Office: 1,062 Days
• Field of Search: 380/4,23,25, 360/60, 358/403
• US Class Current: 705/58
• CPC Class Codes: G06F 21/80 in storage media based on magnetic or optical technology, e.g. disks with sectors preventing unauthorised reproduction or copying of disc-type recordable media G11B20/00
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• CPC Class Codes: G11B 20/00123 the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier
• CPC Class Codes: G11B 20/00173 wherein the origin of the content is checked, e.g. determining whether the content has originally been retrieved from a legal disc copy or another trusted source
• CPC Class Codes: G11B 20/00543 wherein external data is encrypted, e.g. for secure communication with an external device or for encrypting content on a separate record carrier
• CPC Class Codes: G11B 20/00557 wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
• CPC Class Codes: G11B 20/00586 said format change concerning the physical format of the recording medium
• CPC Class Codes: G11B 23/30 with provision for auxiliary signals
• CPC Class Codes: G11B 23/42 Marks for indexing, speed-controlling, synchronising, or timing

Abstract

Several approaches to serializing a disc may be used in the present invention. First, portions of a disc (such as sector(s) or track(s)) may be physically damaged to create a pattern of damage that somewhat uniquely identifies the disc. A number of different techniques may be used to damage the disc. For instance, laser devices may be used, sharp devices may be used or a master disc may be configured to create the damage. The physical damage may be used in conjunction with soft damage that is encoded in software on the disc. Alternatively, certain soft damage approaches may be used separately to serialize the disc.

Claims

1. A method of serializing a read-only optical disc comprising the steps of:

physically damaging a portion of the optical disc to create a pattern of damage;

encoding the pattern of damage in an identifying value to distinguish the optical disc from other optical discs;

encrypting the identifying value; and

marking the optical disc with the encrypted value.

2. The method of claim 1 wherein the step of physically damaging the portion of the optical disc to create the pattern of damage further comprises the step of using a laser device to physically damage the portion of the optical disc to create the pattern of damage.

3. The method of claim 2, further comprising the step of encoding values on the optical disc that indicate that a portion of the optical disc is bad.

4. The method of claim 1 wherein the optical disc includes tracks and wherein the step of physically damaging the portion of the optical disc to create the pattern of damage further comprises the step of physically damaging at least one track of the optical disc to create the pattern of damage.

5. The method of claim 4, further comprising the step of encoding values on the optical disc that indicate that a portion of the optical disc is bad.

6. The method of claim 3 wherein the step of encoding the pattern of damage in the identifying value further comprises the step of encoding in the identifying value which tracks have been damaged by the physically damaging step.

7. The method of claim 1 wherein the optical disc includes sectors and wherein the step of physically damaging the portion of the optical disc to create the pattern of damage further comprises the step of physically damaging at least one sector of the optical disc.

8. The method of claim 7 wherein the step of encoding the pattern of damage in the identifying value further comprises the step of encoding which of the sectors has been damaged by the damaging step in the identifying value.

9. The method of claim 1 wherein the optical disc includes a hub and wherein the step of marking the optical disc with the encrypted value further comprises the step of marking the hub of the optical disc with the encrypted value.

10. The method of claim 1, further comprising the step of using an optical detector to discern the pattern of damage on the optical disc.

11. The method of claim 1, further comprising the step of reading the optical disc to discern the pattern of damage on the optical disc.

12. The method of claim 1 wherein the step of physically damaging the portion of the optical disc to create the pattern of damage further comprises the steps of:

providing a master for producing the optical disc, the master being constructed to produce the optical disc with the pattern of damage; and

producing the optical disc with the pattern of damage using the master.

13. The method of claim 10, wherein the step of physically damaging the portion of the optical disc comprises the step of physically damaging a portion of the optical disc using a laser device.

14. The method of claim 12 wherein the step of physically damaging the portion of the optical disc comprises the step of physically damaging at least one track of the optical disc.

15. A method of serializing a first optical disc and a second optical disc, comprising the steps of:

physically damaging a portion of the first optical disc to create a first pattern of damage;

generating a first identifying value that encodes the first pattern of damage;

encrypting the first identifying value;

marking the first optical disc with the encrypted first identifying value;

Physically damaging a portion of the second optical disc to create a second pattern of damage that differs from the first pattern of damage;

generating a second identifying value that encodes the second pattern of damage, the identifying values of the first optical disc and the second optical disc for distinguishing the first optical disc from the second optical disc;

encrypting the second identifying value; and

marking the second optical disc with the encrypted second identifying value.

16. The method of claim 15 wherein the step of physically damaging the portion of the first optical disc to create the first pattern of damage further comprises the step of using a laser device to damage the portion of the first optical disc to create the first pattern of damage.

17. The method of claim 15 wherein the step of physically damaging the portion of the second optical disc to create the second pattern of damage further comprises the step of using a laser device to physically damage the portion of the second optical disc to create the second pattern of damage.

18. An optical disc comprising:

a physically damaged portion that is damaged to create a pattern of damage on the optical disc;

a non-damaged portion for storing data in a read-only format; and

an encrypted value marker that encrypts an identifying value for distinguishing the optical disc from other optical discs, wherein said identifying value encodes the pattern of damage in the physically damaged portion.

19. The optical disc of claim 18 wherein the physically damaged portion comprises a plurality of tracks, some of which are damaged to create the pattern of damage on the optical disc.

20. The optical disc of claim 18 wherein the physically damaged portion comprises a plurality of sectors, some of which are damaged to create the pattern of damage on the optical disc.

21. The optical disc of claim 18 wherein the encrypted value marker is legible to a viewer.

23. The method of claim 18, further comprising the steps of:

requiring a user of the optical disc to provide the encrypted identifying value to an authenticator; and

authenticating the encrypted identifying value by decrypting the encrypted identifying value provided by the user to extract the first value encoding the pattern of damage and comparing the extracted first value with a first value corresponding to the pattern of damage on the optical disc.

22. A method of serializing an optical disc comprising the steps of:

physically damaging a portion of the optical disc to create a pattern of damage;

encoding the pattern of damage in a first value;

combining the first value with a second value to produce a combined value;

encrypting the combined value to produce an encrypted identifying value; and

marking the optical disc with the encrypted identifying value to distinguish the optical disc from other optical discs.

24. A method of serializing a plurality of optical discs comprising the steps of:

for each disc,

selecting an identifying value that is different from the identifying values of other discs so as to distinguish the disc from other disc;

physically damaging a portion of the disc to create a pattern of damage that encodes the identifying value;

encrypting the identifying value; and

marking the disc with the encrypted value.

25. A method of serializing an optical disc and authorizing a user of the optical disc comprising the steps of:

physically damaging a portion of the disc to create a pattern of damage;

encoding the pattern of damage in an identifying value to distinguish the disc from other discs;

encrypting the identifying value;

providing the disc with the encrypted value;

decrypting the encrypted value;

detecting by a disc reader the pattern of damage in the physically damaged portion of the disc; and

authorizing the user of the disc when the detected pattern of damage corresponds to the decrypted value.