This guide should be followed and the resolution written below applied prior to following the resolution specified in KBA 01-03-03. By creating a registry key, Spindle is configured to emulate the encryption level of v3 PDF libraries while using the v4 creation libraries.

PDF Viewers Tested

Software Version Tested AES-128 AES-256
Adobe Reader 9.0 and newer OK OK
Foxit Reader OK OK
Nuance PDF Reader 8.1 OK OK
Sumatra PDF 2.5.2 OK OK
PDF Complete 4.1.45 OK NO
Nitro Pro 10 10 OK OK

Versions Applicable

  • Spindle Professional 6


1. Open Registry Editor on the machine that's processing the jobs

2. Browse to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Draycir\Spindle Professional\Generic\Distribution\PDF

3. Right-click and add a DWORD (32bit) item with the name Use Legacy Encryption

4. Change the value of Use Legacy Ecnryption item to 1 and click OK

5. In Spindle Professional Tools, ensure the PDF creation library within the Document Automation is set to v4

Documents will have to be processed again for the changes to take in effect.