Data process apparatus and method therefor
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United States of America Patent
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Dec 9, 2008
Grant Date -
Oct 9, 2003
app pub date -
May 9, 2003
filing date -
Feb 27, 2002
priority date (Note) -
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Abstract
In an image process apparatus, a key different for each level of hierarchy is generated on the basis of a specific key with respect to image data having a hierarchical structure, the image data in each level of the hierarchy is encrypted using the generated key for each level, and the specific key is managed, so that key management can be easily performed while the image data having a hierarchical structure is enciphered using different keys for each level of the hierarchy.
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