[WorldMaker]

"Some rights reserved" is a still a sometimes useful, though cheeky, signal for copyleft, Creative Commons, or open source, though. (From what I recall, it started a branding/marketing choice from Creative Commons, but in the wild I've seen it in more places than just CC licensed works.) It's not legally binding in any way, just a fun signal to humans that they might have more rights to play with than full copyright.

[JohnFen]

My habit is to use "All Rites Reversed."

That also has no legal effect, but it's fun. Hail Eris!