Computer software protection
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 15, 1994
Grant Date -
N/A
app pub date -
May 23, 1991
filing date -
May 31, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A master copy of a software file has within it a predetermined block of data. When a copy of the file is made that block of data within the copied file is located and overwritten with data identifying the copied file. When an unauthorized copy is found, the data identifying the copy can be read and the source of the unauthorized copy may be traced. The invention is particularly suited to use with software distribution over a computer network in which details such as the time the copied file was made and the name of the authorized user can be embedded within the copy.
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