It looks like Sony and a few other publishers are going to implement some form of DRM protections more in the coming months, judging from a few facts surfaced this week: the PSN release of Tomb Raider requires gamers to sign in into the Playstation Network in order to launch the title and judging from some reports, the demo version of The Last Of Us has the same protection scheme.

The Last Of Us demo, released together with God Of War: Ascension, can only be played with an active internet connection and while signed on PSN: without either of these, the demo won’t launch. Luckily God Of War: Ascension doesn’t have any form of DRM protection, but includes the usual Online Pass system in the attempt to block the used game market.

Another unusual thing in the demo is a countdown, which can be accessed on the main menu of the game: the countdown should be ending on April 17th. A few gamers have been speculating that a multiplayer demo may be unlocked after the countdown ends: this would also justify the use of the online DRM protection.

The Last Of Us will be available on June 14 exclusively on Ps3.