I bought a copy of DCS Black shark and installed it just fine but when I loaded the game and tried my serial key it didn't work. I sent an email to DCS about it and was basically told that the key belonged to another game and I was trying to basically STEAL a cd-key. Now I bought the box edition, HOW in GOD's GREEN EARTH IS A SERIAL KEY FROM A BOX NO GOOD??? I can provide reciepts and even the upc from the box but nothing, no sure we will look into to it NOTHING!! So I am taking it upon myself to warn others. Becareful with this product because they will not back you up when you need it and you have just lost a FAITHFUL customer due to your SHITTY customer service.:mad::mad::mad: