DATA PROCESSING APPARATUS AND METHOD THEREOF

摘要

In an image process apparatus, a key different for each hierarchy is generated on the basis of a specific key with respect to image data having a hierarchical structure, the image data in each hierarchy is enciphered using the generated key for each hierarchy, 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 the key different for each hierarchy.