04683553 is referenced by 214 patents and cites 15 patents.

The invention relates to a method and a device for protecting software delivered to a user by a supplier. The method amounts to rendering the programs non-executable in the state in which they have been delivered to the users. With each program (P.sub.i) there is associated a validation key defined via a main validation key (V.sub.i) delivered by the supplier and recorded in a storage area (M) of the user's machine (1), and via a supplementary key (V'.sub.i) computed on the lever of a card (C) issued to the user via a secret code (S) and via arguments (b.sub.i) that identify each program (P.sub.i) and are recorded in a storage area (M1) of the card (C).

Title
Method and device for protecting software delivered to a user by a supplier
Application Number
476494
Publication Number
4683553
Application Date
February 5, 1986
Publication Date
July 28, 1987
Inventor
Jean Mollier
Bougival
FR
Agent
Kerkam Stowell Kondracki & Clarke
Assignee
Cii Honeywell Bull
FR
IPC
H04L 9/00
View Original Source