GAL/PAL - Read the UES/AND-Array with burned Security Fuse???

If it is one of the smaller 20/24 pin ones, and you cannot read the contents, you can reverse engineer. Start with the circuit (which you wil have, right?), and determine which are IPs and outputs, then get a good device programmer that supports IC testing, and write a set of tests for the PLD. 15-150 lines is typical, and when you have all plausible IPs testing OK, write the boolean eqns in something like ABEL/CUPL and compile, and re-test a NEW programmed GAL against the vectors, and also in-circuit.

-jg