Even if you find a working key on a "gray market" site, these are often stolen or obtained through fraudulent means. Publishers frequently revoke these keys , causing the game to vanish from your library without a refund.
Bypassing digital rights management (DRM) is generally illegal regardless of the reason. Furthermore, it deprives developers of the funds needed to maintain or create future projects. Legitimate Ways to Play "I Am Alive" I Am Alive Pc Game Serial Number Free