Aurora · Jun 3, 2021On the whole unless it's part of a very tightly defined universe in which you would have to define it as fanfiction, on the whole you are largely considered free to write anything you wish. For instance you can't write a book in the lord of the rings universe, that is owned intellectual property, but you can write a fantasy novel with orcs and elves just don't call it middle earth. Or you can write a story about a school of magic, you just can't call it hogwarts. Things like fountain of youth water, age regression virus, etc, are tropes, not intellectual properties. Uhhh... What is Sebtomato's thing.. Parkdale I think.You'd need permission to write in that universe, and you should probably not write in a /similar/ universe that is /too similar/. But while you can't make an "of the dead" movie, you can make a movie about a zombie plague caused by mutated rabies which is basically what "zombie virus" is... Basically you can use a concept, just not a specific owned universe. If that makes any sense. I think I'm right on this.. A good example of this is Galaxy's Edge. Galaxy's Edge is a scifantasy book series that is basically Star Wars meets War Hammer 40k, where the storm troopers are the good guys, the rebels are the bad guys, Han Solo is secretly Boba Fett, Luke is a little girl, C3p0 is a murder bot, Darth Vader is also Palpatine, Yoda is evil, and the whole series is liberally dusted with some of the most hideous racism against Arabs and Nigerians you've ever seen in print (seriously, don't read it if you don't have a strong stomach). Literally not a single element of the story is original, in fact, if you know the original story of star wars, before the final draft for New Hope was settled on, it borrows heavily from the original unused plot. But it's okay. Because while it borrows heavily from the narratives of other intellectual properties it's not a direct copy of an existing IP. Just don't directly copy anything and you're fine generally speaking.