Data protection system, data preparation device, and data working device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Dec 7, 2004
Grant Date -
N/A
app pub date -
Dec 30, 1997
filing date -
Jun 11, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
When a user works data required for allowance for the use thereof, the work processing is carried out by utilizing an exclusive work processing device. Thereafter, only the data of work information indicating what kind of working has been made to the original data (for example, differential static image data indicating a difference between the original static image required for allowance for the use and the static image after having been worked) is stored, whereby the use without permission of the data is prevented.
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