What is encryption and decryption?
A. Acrobat 3.0 introduced the concept of security to PDF files. This security is two-fold : 1) Secure the document from being opened by unauthorized users (“Open Password”) and 2) Secure the document from having certain functions such as printing, selecting and modifying from being performed (“Owner Password”). Until recently, the size of the encryption key was limited to 40 bits. Acrobat 5.0 introduced keys consisting of 128 bits which generally produces a more secure document. activePDF was the first company to provide any level of security to server-side PDF generated products and was the first to provide the 128-bit level of encryption.
