Minecraft on Playstation 4 not working? Need to unlock game?

I've downloaded the minecraft full game on ps4 and i started it up and it says to unlock the game, even tho it says its already installed.
i tried redownloading it again but didn't work.
anyone help?

SkylineMasters 25.12.2015

You need to buy a key from the minecraft website

Seven Man 25.12.2015

If you bought it on a PS3, and are now trying to download it onto a PS4, you have to buy an unlock key from the Minecraft website.

OR

its a small glitch with the licence.
Go to Settings => PSN => Restore Licences, and that should fix it.

Squidmaster 25.12.2015