It's protection system used before B4ME in RA2 and Generals!
Dor unexploding you must have Identical cd key in encrypted file and in the system registry. Or you must fix some bytes in executable file. I wroted tool for Generals and Zero Hour for fixing unit explode, tool get ip adress of pc and set the cd key in registry and in generals.dat file. If you playing in LAN game with identical keys on many(two<) pc game is showing error massege...

sorry for my English, but i'm Russian...