From Peter's Software:
KeyedAccess is an add-on module for Microsoft Access that handles product key/unlock code validation, giving developers the ability to create secure trial versions of their applications, or to enforce monthly or yearly software license renewal. Only a key provided by the application developer will fit the unique lock that KeyedAccess creates on each end-user's computer, and software pirates are prevented from getting around registration screens.
What's new in this version:
Version 4.2 Fix for Error 52 that occurred on some Vista computers.