thereat: I saw this in a form lease for an apartment. It said, approximately, that it would violate the lease to loiter in the front courtyard or to play “thereat”, which I guessed was pronounced /THII-ree-at/. The lease didn’t mention any other game, so singling out “thereat” in a lease meant it must have been extremely dangerous. I wondered what kind of game was so threatening that it required a stand-alone mention in the lease, or even if it’s still a game. I couldn’t remember having played a game called that. I don’t recall how long it took me to recognize my error.
TL, DR: This means ‘too long, didn’t read’. So, using it in a paragraph caption in a legal license seems to imply that the counterparty need not read it and therefore that it wouldn’t be binding. Here’s the whole paragraph, including the boldface caption: “TL, DR: You’re purchasing a license, you’re not purchasing media.” If that’s too long, I don’t know what’s short.