Hmmm, it's using the same code as GC1 to steal a tech. If you e-mail me a save game file, I can check it out to see if the Drengin really did research it. Maybe they managed to research it out of order, or mabye someone who did have it traded it to them. The AI can trade techs among themselves, we just don't have the interface complete for you to trade with the AI yet.