Angry Birds is the intellectual property of Rovio and distributing it without their permission is illegal. Sharing your own personal modifications is completely different from sharing someone else's copyrighted material.

I have contacted Miika asking for an official statement about Angry Birds and asking about sharing the free game. Please wait for a response.

Also, please stop creating more threads about this (not that this is going to help because obviously the people creating the other threads aren't reading this one...) :P