I wouldn't trust this post. MadGamer asked WHERE they were obtained from, and you just hurried to a conclusion, assuring him that they were legitimate without any proof. Do you even have any proof?
Keys are probably going to work without issues even though they illegally obtained because BitDefender is known for not doing anything against them AFAIK . I guess you guessed just by the way he answered me. Its not logical for someone to sell keys for 3.99$ while their actual price is 39.99$ on the official BitDefender website anyway.