Hello,
On the DVDFab forum, I found a tip from a moderator named Blazkowicz:
Create a backup of:
[HKEY_CURRENT_USER\Software\Cyberlink\Common]
[HKEY_LOCAL_MACHINE\SOFTWARE\CyberLink\Common]
Application Data\CyberLink
Application Data\PDVD
Use the attached script for resetting the BD Region counter to 5 changes.
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I have no Blu-ray equipment, so I cannot test it myself, but perhaps this information helps you write a new version of your tool. As far as I know, DVDFab Passkey currently does not work with PowerDVD 11 either.
Many greetings,
A Pal