– if you're interested in a helpful, legitimate article about Angry Birds Rio :

A widely cited key for older PC versions of Angry Birds (including Rio) is: THET-ALEV-LEFR-USWO Server Shutdown Bypass:

A: The activation process may vary depending on the platform. Typically, you will need to enter the activation key during the installation process or in the game's settings menu.

Difference between product key and activation code - Microsoft Support