Stamp already encrypted and protected PDF documents
Sometimes it is neccesary to encrypt PDF documents to prevent changes or extracting content of them. As encryption is a high performance task the SetaPDF-Stamper component offers the facility to stamp already encrypted documents without re-encrypting the whole document but just the new content. Which leads into a performance boost when delivering stamped and encrypted documents.
This solution is perfect if the offered PDF documents were not encrypted with a user password (the password that is needed to open the document) but the encryption "just" restricts features like copy&paste.