Method and apparatus for upgrading the software lock of microprocessor

• US 5,790,783 A
• Filed: 03/28/1996
• Issued: 08/04/1998
• Est. Priority Date: 03/28/1996
• Status: Expired due to Term

• Current Assignee: Advanced Micro Devices, Inc.
• Original Assignee: Advanced Micro Devices, Inc.
• Inventors: Lee, Sherman, MacDonald, James R., Wisor, Michael T.
• Primary Examiner(s): Beausolire, Jr., Robert W.
• Assistant Examiner(s): Elmore, Stephen C.
• Application Number:
  US08/623,020
• Time in Patent Office: 859 Days
• Field of Search: 395/186, 395/726, 364/DIG. 1, 364/280, 380/25, 380/59, 380/23
• US Class Current: 726/20
• CPC Class Codes: G06F 11/006 Identification G06F11/2289 takes precedence
• CPC Class Codes: G06F 21/12 Protecting executable software
• CPC Class Codes: G06F 21/73 by creating or determining hardware identification, e.g. serial numbers
• CPC Class Codes: G06F 2207/7219 Countermeasures against side channel or fault attacks
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress

Abstract

A method and apparatus for providing, maintaining and upgrading the software lock of a microprocessor. When a processor upgrade occurs, software that was serialized to the previously installed processor detects that it is running on an unauthorized processor. The software initiates a reauthorization process based on a reauthorization use profile. The temporary re-enabling of the software is allowed if the authorization service is not available.

Claims

1. A method for performing a software lock, comprising:

reading a first serial number of a currently installed microprocessor;

retrieving a second serial number of a previously installed microprocessor;

comparing said first serial number and said second serial number;

seeking authorization to perform said software lock with said first serial number; and

performing said software lock with said first serial number if said authorization is obtained.

2. The method of claim 1, wherein said reading step includes:

providing a first encryption key;

decrypting said first serial number with said first encryption key;

providing a second encryption key; and

decrypting said first serial number with said second encryption key.

3. The method of claim 2, wherein said second encryption key is provided with said first serial number and is decrypted with said first serial number with said first encryption key.

4. The method of claim 1, wherein said seeking step includes accessing an authorization use profile.

5. A system for performing a software lock, comprising:

means for reading a first serial number of a currently installed microprocessor;

means coupled to said reading means for retrieving a second serial number of a previously installed microprocessor;

means coupled to said reading means and said retrieving means for comparing said first serial number and said second serial number;

means responsive to said comparing means for seeking authorization to perform said software lock with said first serial number; and

means responsive to said seeking means for performing said software lock with said first serial number.

6. The system of claim 5, wherein said means for reading includes means for decrypting said first serial number.

7. The system of claim 6, wherein said decrypting means includes

first means for providing a first encryption key;

means coupled to said first providing means for decrypting said first serial number with said first encryption key;

second means for providing a second encryption key; and

means coupled to said second providing means for decrypting said first serial number with said second encryption key.

8. The system of claim 7, wherein said second encryption key is provided with said first serial number and said first serial number decrypting means includes means for decrypting said second encryption key.

9. The system of claim 6, wherein said seeking means includes means for accessing an authorization use profile.

10. An apparatus for upgrading a software lock of a computer system, comprising:

an upgrade microprocessor having a first serial number associated therewith;

a storage device coupled to said upgrade microprocessor and configured to store a second serial number of a previously installed microprocessor; and

means for upgrading software lock from said previously installed microprocessor to said upgrade microprocessor, said upgrading means including;

means for comparing said first serial number and said second serial number;

means responsive to said comparing means for seeking authorization to perform said software lock; and

means responsive to said seeking means for performing said software lock.