Even if you possess a 100% legal, unused CD key from an old physical boxed copy of the game, entering it into the prompt will often fail or time out because the game cannot reach the server to verify it. No Official Support:
To unlock the full version of on PC today, you often don't need a specific official key, as the original activation servers are no longer active. For most legacy versions, entering a series of random characters or specific placeholder keys will bypass the prompt and grant access to the complete game. Quick Activation Keys angry birds space activation key pc link
Here is the hard truth: