FileCrypt Acrobat Pro

Digitally sign (authenticate) your PDF files in Adobe Acrobat Professional using PGP Key provided by the FileCrypt Acrobat Pro software. A signed PDF document allows the reader of this document to verify this signature and to be sure that the document has not been altered during its transfer. It also allows the reader to know for sure who is the author of the PDF document.
Here are some key features of "FileCrypt Acrobat Pro":
ï¿­ OpenPGP Key creation
ï¿­ Integrated signature in PDF document
ï¿­ Complete integration in Adobe Acrobat Professional
ï¿­ Multiple signatures on the same document
ï¿­ Revision handling (signature on different version of the same document)
ï¿­ Interaconnectivity with FileCrypt Desktop Pro 1.7
ï¿­ Easy-to-use interface
Requirements:
ï¿­ Adobe Acrobat Pro 6 or 7 installed
Limitations:
ï¿­ 30 days evaluation period