- Pdf certificate encryption can only be used with AESV2/AESV3 rather than RC4?
- Pdf certificate encryption need "Digital ID"
- Register existing "Digital ID" by Adobe Acrobat/Reader
- Create new self-signed "Digital ID" by Adobe Acrobat/Reader
[ref]
http://www.pdfzone.com/c/a/Document-Management/PDF-Security-Part-II-Creating-a-Digital-ID
http://forums.adobe.com/community/acrobat/acrobat_windows
http://forums.adobe.com/message/2130804#2130804
http://help.adobe.com/en_US/Acrobat/9.0/Standard/WS58a04a822e3e50102bd615109794195ff-7d95.w.html
