Windows Vista & Above
C:\Documents and Settings\All Users\Application Data\LockLizard\PDCViewer\
To access the keystore files on the Mac, open Finder and one of the options across the top is Go. Click on that and one of the drop down options is Go to Folder. Click on that, and in the file bar that is in the new panel that opens, type in the folder name .LizardSafeGuardPDFViewer (be sure to include the .). That will then show you the contents of the hidden folder. On older Macs (e.g. 10.3.9), typing the path /Users/Shared/.LizardSafeGuardPDFViewer/ opens the hidden folder.
If you are using a Mac which has multiple user accounts then see – I can’t get the Mac Viewer to work with multiple user accounts.