| 摘要 |
PROBLEM TO BE SOLVED: To obtain no electronic document in a redistribution-possible form at the time of a decoding processing and an interpretation processing by storing a self-protection document having data containing a ciphering content segment, a permission segment and a code segment. SOLUTION: A self-protection document having a ciphering content segment, a permission segment and a code segment. In such a case, a document content 410 is transferred to a ciphering part 412. The ciphering part 142 receives the secret key 414 of a user and decodes the document content 410 through a decoding step 416. At that time, the ciphering part 412 receives a ciphering key 418 from the system of the user. The ciphering part 412 uses the ciphering key 418 and converts the document into a version where the ciphered content 420 is made to be the content. The ciphered content 420 is transferred to an interpretation-use application 424 in a protection shell 422. |
