The Share Play feature is one of the big additions coming to the PS4 in firmware update 2.0, which releases on October 28th, and Sony has a released a short video explaining how it all works. First off the Share Play function will be available through the party chat system, and here you have two options on how to use the feature. The first option is to pass the controller virtually to your friend so they can have a go on the game you’re playing. While the game’s owner will need Plus to activate Share Play, the person taking control virtually will not.
That isn’t the case though if you want to play a multiplayer game through Share Play as all participants will need Plus. In the video a timer for one hour appears from the moment is activated, so each session can only last that long. However, it could bepossible just to start a new party and continue from where you left off, though that needs clarifying. The potential of Share Play is pretty huge since you can practically borrow a friend’s copy, and use it as a demo to see if you like a game before buying it. Or if you need a co-op partner you can invite someone to help through Share Play.