The Fantasy Trip (TFT) is a classic tabletop roleplaying game (RPG) that was first published in the early 80s and designed by Steve Jackson. After he left Metagaming, that company died a quick death and he went on to found Steve Jackson Games and came out with GURPS. Meanwhile, the The Fantasy Trip rulebooks went out of print and into copyright limbo.
There are some of us, though, that still love the simplicity and clarity of the original TFT rules. The entire rulebook set is included in three books: Melee (combat rules), Wizard (magic rules) and In the Labyrinth (roleplaying/campaigning rules). Melee and Wizard also had advanced rulebooks published as Advanced Melee and Advanced Wizard–these were the core of TFT.
When Metagaming went out of business, the copyright status of the game became questionable. There are a few sources for the rules online, from the original Microgames (basic Melee and Wizard) to TFT (Advanced Melee, Advanced Wizard and In the Labyrinth).
Some of these sources post the rulebooks openly, while one asks for a statement of intent that the rules will be for personal use. These are listed below:
Brainiac Vault. This is the Mother Lode. Brainiac has PDF copies of all of the rules, plus the various Microgames, Microquests and other game supplements. This site requests a fair use statement from the requester.
Branya. Branya has a PDF copy of the In the Labyrinth rules as well.
Note: It has been 30+ years since TFT was originally published. I will admit I do not know copyright laws, but I am trying to find out the no-kidding status of the rules–at least for fan use and distribution.