How to Add the Encrypt PDF Context Menu Item?

Make sure you have downloaded pdftk

Windows XP and Windows 2000:

1. In the Windows File Explorer menu, select Tools > Folder Options . . . and click the File Types tab. Select the PDF file type and click the Advanced button.
2. Click the New . . . button and a New Action dialog appears. Give the new action the name Encrypt.
3. Give the action an application to open by clicking the Browse . . . button and selecting cmd.exe, which lives somewhere such as C:\windows\system32\ (Windows XP) or C:\winnt\system32\ (Windows 2000).
4. Add these arguments after cmd.exe, changing the path to suit, like so:

C:\windows\system32\cmd.exe

/C C:\windows\system32\pdftk.exe "%1" output "%1.encrypted.pdf"

encrypt_128bits user_pw PROMPT


5. Click OK, OK, OK and you should be done with the configuration.