How to digitally sign a pdf file.
1. Insert USB token tool in the computer.
2. Install the software in the computer ( setup.exe, WD_ProxKey.exe )
3. Open Acrobat Reader
4. Goto to Tools à Certificates.
5. Click on “digitally Sign”
6. Select certificate, create sign and Save the docs.
7. On Prompting for key, enter the same.