Want to share your games with friends or family members on a different PlayStation 4, perhaps so you can play the same game together? Sony allows that — with some minor limitations.
Usually called gamesharing (though Sony actually refers to this feature as Share Play), you can let other people download and play games you've purchased, even if they don't own it. Think of it like lending a disc — only there's no need to actually exchange physical media.
In order to play a game together, both you and your friend need a PlayStation Plus subscription, but neither of you need a subscription to play the game separately.
In addition, while you can share your games with any number of other people on different PS4 consoles, only two people can play a game at one time.
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How to gameshare on PS4
1. On the console that you want to share games with, log in with your PlayStation account.
2. Select "Settings."
3. Select "Account Management."
4. Select "Activate as Your Primary PS4."
5. Confirm this choice by selecting "Activate."
That's it — now, your friend will see all your games in their library, and can download and play them.