If you have not checked Steam recently, and you like to play rather old games without copyright infringement, you should definitely check their store.
The 11th Hour, The 7th Guest, Shadow Man, I Have No Mouth, and I Must Scream, Anachronox, Daikatana, Uban Chaos, Knights and Merchants, Startopia, Pandemonium, Enclave, Deathtrap Dungeon, Silent Storm, Septerra Core, Gorky 17, Shadow Warrior, Omikron: The Nomad Soul, Blood Omen 2: Legacy of Kain are all for sale now.
Most of these games belong to early 2000s, an age of evolving 3D and last massive non-indie genre experiments. A good chance to make an applied research in game design combined with a warm nostalgia.
Social media is a tricky place, so I decided to shade controversial words at a failed Daikatana ad. If this is the first time you see this, you may find a short story about it at 'Reception and controversy' section here.