Method and apparatus for enabling trial period use of software p

Details Method and apparatus for enabling trial period use of software p Method and apparatus for enabling trial period use of software p

1994-04-25

1996-10-08

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 9, 380 21, 380 23, 380 25, 380 49, H04L 900

Patent

active

055639461

ABSTRACT:
A method and apparatus is provided for transferring encrypted files from a source computer to one or more target computers. An export program is provided in the source computer and an import program is provided in the target computer. The export program decrypts the encrypted file and tags the export operation with an export counter value. The clear text file is then encrypted with an encryption operation utilizing a key which is unique to a transfer memory media, such as diskette serial number. The memory media is carried to a target computer which utilizes the import file to decrypt the encrypted file.

REFERENCES:
patent: 5191611 (1993-03-01), Lang
patent: 5337357 (1994-08-01), Chou et al.
Konigs, H.-P.: "Cryptographic Identification Methods for Smart Cards in the Process of Standardization" IEEE Communications Magazine, vol. 29, No. 6 (Jun. 1991), pp. 42-48.
"Data Masking Algorithm" (IBM Technical Disclosure Bulletin, vol. 32, No. 6B, Nov. 1989).
"Information Distribution via Rom Disks" (IBM Technical Disclosure Bulletin, vol. 33, No. 12, May 1991).

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