Method of software distribution protection

• US 5,337,357 A
• Filed: 07/27/1993
• Issued: 08/09/1994
• Est. Priority Date: 06/17/1993
• Status: Expired due to Fees

• Current Assignee: SafeNet Incorporated (Thales SA)
• Original Assignee: Software Security, Inc. (Thales SA)
• Inventors: Engel, Frederik, Elteto, Laszlo, Kulinets, Joseph M., Chou, Wayne W.
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/097,705
• Time in Patent Office: 378 Days
• Field of Search: 380/4, 380/21, 380/23, 380/24, 380/25, 380/43, 380/49, 380/50, 340/825.31, 340/825.34
• US Class Current: 705/56
• CPC Class Codes: G06F 12/1408 by using cryptography for digital transmission H04L9/00
• CPC Class Codes: G06F 21/101 by binding digital rights to specific entities
• CPC Class Codes: G06F 21/121 Restricting unauthorised execution of programs
• CPC Class Codes: G06F 2221/2107 File encryption
• CPC Class Codes: H04L 2209/56 Financial cryptography, e.g. electronic payment or e-cash
• CPC Class Codes: H04L 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 9/0866 involving user or device identifiers, e.g. serial number, physical or biometrical information, DNA, hand-signature or measurable physical characteristics
• CPC Class Codes: H04Q 2213/1305 Software aspects
• CPC Class Codes: H04Q 2213/13339 Ciphering, encryption, security
• CPC Class Codes: H04Q 3/0029 Provisions for intelligent networking

Abstract

A method is provided for protecting distributed software which relies on a unique factor such as an accessible serial number or the generation of a profile or fingerprint of the computer of the user which is entered individually and/or with a random factor to generate a unique first key which will differ for different computers. The first key is sent to a processing center which then generates a second key. The user applies the second key which compares the unique and/or random factors. If the comparison matches, the first and second keys are used in an algorithm in the software to generate a decrypting key permitting the customer to purchase the selected program(s).

Claims

1. A method of protecting distributed encrypted software of a distributor from unauthorized use by a user in a user'"'"'s computer comprising the steps of

generating data which describes a unique factor of the computer of the user,

entering said data along with a random factor into a file of the computer of the user,

generating a first key based on said data and said random factor,

transmitting the first key to a processing center which controls the user of the distributed program,

sending a second key from the processing center to the user which second key is related to said user'"'"'s first key,

entering the second key in the user'"'"'s computer for regenerating said file in the user'"'"'s computer,

comparing said file in said user'"'"'s computer with said regenerated file,

denying access to said encrypted software when said comparison fails to produce a match, and

combining said first and second key by means of an algorithm in said software when a match occurs for providing a decrypting key for decrypting the distributed software and

decrypting said encrypted software thereby gaining access to said encrypted software.

2. The method as claimed in claim 1 wherein said distributed encrypted software has a plurality of different programs and program combinations including the steps of

encrypting each program and program combination with a different algorithm and first key,

generating a different second key from said processing center for each program and program combination, thereby enabling the user to select the program desired.

3. A method of protecting distributed encrypted software of a distributor from unauthorized use of a user in the user'"'"'s computer comprising the steps of

selecting a unique factor of the computer of the user,

generating a first key based on said unique factor,

transmitting the first key to a processing center,

deriving a second key at the processing center which is related to said first key,

entering the second key in the user'"'"'s computer,

regenerating said unique factor of said first key in the user'"'"'s computer using said second key,

reading and comparing said unique factor with said regenerated unique factor,

denying access to said encrypted software when a match is not provided by said comparing step,

combining said first and second key by means of an algorithm in said software for generating a decrypting key for decrypting the distributed software, and

decrypting said encrypted software thereby gaining access to said encrypted software.

4. The method as claimed in claim 3 including the step of integrally incorporating said unique factor in the computer of the user.

5. The method as claimed in claim 3 including the steps of

generating data which identifies an original file and constitutes said unique factor of the computer of the user,

entering said original file into said computer of the user, and

deriving said first key from said original file.

6. The method of protecting mass distributed encrypted software of a distributor from unauthorized use of a user in a user'"'"'s computer comprising the steps of

selecting data which comprises a random factor for the user'"'"'s computer,

storing said data into a file of the user'"'"'s computer,

generating a first key based on said file,

transmitting the first key to a processing center,

deriving a second key at said processing center based on said first key,

transmitting said second key from the processing center to the user,

entering the second key in the user'"'"'s computer,

reading said file containing said random factor,

regenerating said first key from said stored random factor,

comparing said file with said regenerated first key,

denying access to said encrypted software in the absence of a match in said comparison step, and

combining said first and second key by means of an algorithm in said software for generating a decrypting key for decrypting the mass distributed software, and

decrypting said encrypted software thereby permitting the user to gain access to said software.