Method and device for protecting software delivered to a user by a supplier
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United States of America Patent
Stats
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Jul 28, 1987
Issued Date -
N/A
app pub date -
Feb 5, 1986
filing date -
Mar 18, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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).
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