ah, my bad then
and actually there is a way, you can add him on steam then go to the store page of the specific dlc and check if he owns it or not, but it's too much trouble for most people, and i don't think there is anyone would make such an effort just to check so yeah :P
anyways, thanks for the giveaway and have a good day Devious :)

Yea I already have it, you can choose another winner.