No GenoZStriker, you are wrong. What you described is what DLC is supposed to be. What I'm talking about is some lame shit that Namco did with SoulCalibur IV, and that Capcom also did with Street Fighter IV. There could be other games, but these are the one I remember.
They basically put content on the disc and they "lock it". They then make you purchase "DLC" keys that unlock the content that is already on the disc you paid for. That's what they are doing with BF:BC2, but you can get it free if you buy it new. That's not as bad as what Capcom and Namco did because there was no way to get that stuff for free, but it's still lame.