Hi folks! The key is from amazon.com.

http://www.amazon.com/Company-Heroes-Game-Year-Download/dp/B004VNHRQW

caution: A friend who also bought it on amazon reportet to me that he could not redeem this game on steam. I will send you proof of original key but I can not garantee it will work on steam. So please don't be disappointed! remember it's a gift.

Please only join if you read and agreed to the above description.
(I believe it will work, because all my amazon.com keys worked until now - but who knows...)

feel free to post your opinion below, because I'm really confused now

proof: http://www.bilderhoster.net/safeforbilder/ttsz5pn8.jpg