Can I download and play games from a friend's PSN account on a PS4?

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So this is the situation:
- My brother received a PS4 on his birthday.
- He doesn't have a PS+ account, and I don't have a PS4, so I activated it as my primary PS4.
- Based on what I've read on the FAQ, any user can play my digital games and do online gaming since I activated the system as my primary PS4.
- A friend offered his account so we can play his digital games. He has a primary PS4 activated.
The question is, can we really play his games without any issues? For example, can we download GTAV from his account and play it using any account on our PS4?
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