PS4 Allows You To Finish A Fellow Player's Game For Them?

Does anyone have any information on the PS4 being able to allow gamers to finish another's game for them? I read that you can jump into your friend's game and finish a level for them perhaps if they're stuck?

How will Sony prevent gamers from playing an entire game that they don't own through this feature? It would be great if there was more information on this feature.

Will Xbox One allow this?

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