Arma 3 Lite Keys for everyone! ;O

It is, you just can't access multiplayer

No, it's not.

While the Arma 3 Alpha leads Steam’s Top Sellers chart since launch, Bohemia Interactive today also made a free invite-only variant available. The Arma 3 Alpha Lite is a limited version of the Arma 3 Alpha – providing people with the opportunity to try out the singleplayer showcase missions, a selection of weapons and vehicles, and the scenario editor. Unlike the regular Arma 3 Alpha, the Arma 3 Alpha Lite does not feature a multiplayer component or modding support, and does not include access to the Arma 3 Beta and complete game later on. To participate in the Alpha Lite, people need to be invited by those who have purchased the regular Arma 3 Alpha. The Arma 3 Alpha Lite will be discontinued on June 18th, 2013.

Copy paste for the win. <3

Same here, tried again and it worked

1st time I got it too but at 2nd time it worked :P