Try this 27705MV then this BHKIYB3 (I know that the second is basically for 382 days or something but I'am nots ure about the first one ) . I found them on a video , BitDefender keys can be used multiple times as far as I know .
Came here to post this. I'm using the second key and so are most of my family and the computers at my office. Works great, can be instaleld an unlimited number of times I think.