Comment by WorldMaker

The MS-RL is still the shortest, clearest copyleft license I'm aware of it. It is nearly as readable as the MIT. https://opensource.org/license/ms-rl-html

It's just weird that it has "Microsoft" in the name. Though I suppose not much weirder than MIT license being named after a University or BSD license being named after a University's Unix distribution.

Also even Microsoft doesn't use the MS-RL much anymore having standardized more on MPL where they use copyleft licenses and Apache License most everywhere else.