[edent]

Interestingly, when I did something similar on Twitter a few years ago, I received a very polite email from the people who owned the trademark to "Choose Your Own Adventure" requesting that I not use that specific phrase.

As far as I could tell, they didn't actually have the ™ for computer games at the time. But I can understand how they didn't want to become a genetic brand like Kleenex or Hoover.

(https://shkspr.mobi/blog/2015/01/writing-a-choose-your-own-a...)

[hyperthesis]

Depending on jurisdiction, technically, a trade mark ™ is established by use, for the tort of passing off. A registered trademark uses the encircled R symbol: ®

You may be thinking of copyright, which at one time did not explicitly include computer programs as protected works, depending on jurisdiction.

[alanjay]

AIUI, the book "20 Goto 10" also avoids referring to itself as CYOA, despite its similarities for the same legal reason.