This guide is intended only for regaining access to your own data on devices you own. Attempting to unlock CPK protection on a USB drive or folder belonging to another person without explicit permission violates computer fraud and abuse laws in most jurisdictions (CFAA in the US, Computer Misuse Act in the UK). You have been warned.
Why this works: Older versions of CPK stored lock status in plain registry DWORD values. Changing them forces the driver to treat the drive as "unlocked." unlock cpk protection