| 摘要 |
<p>Systems and methods provide a mechanism to protect the integrity of electronically derivative works. One aspect of the systems and methods includes receiving an original document including a first digital signature. After the document is derived, a second digital signature is created. The second digital signature may include the first digital signature, a message digest from the first digital signature, and a message digest for the second digital signature. A further aspect of the systems and methods include assigning a security key to a document processing application. The assigned key may be used to produce the second document signature.</p> |
