umm... i bought my warcraft 3 cd from a gamer shop... but i know it isn't original.. cos it should've come with a box too... so now my problem is.. if i dun buy the original cd i cannot play in battlenet whatever i do loh?

what should i do? even my friend can download 1.21 version even though his also not original.. mine too but i can't dl the 1.21 patch and no-cd patch..