Sounds like physical games that must be activated on Steam to be able to be played. Once you activate them you can't play on another account even if you have the DVD (but sometimes it's just a code in the case). That's an opposite of most physical console games that can be resold and played on other consoles, under other accounts.
For example I have The Evil Within phsyical collector's edition (awesome game btw) and it comes with a Steam code. I can't play the game under other Steam accounts. And the physical DVDs are worthless, I can't resold them. On the other hand if I would have bought the game on PS4 or XBox One I could just give the disks to someone else and they can play the game no problem.