ARR-Checker

This mod prints an evaluation of the license for all mods being loaded to the console.
It will try to warn the user of all mods that may not be free to use, or open-license, or ones that use a custom license, which is believed by many to be a bad practice. (One that I have been guilty of.)

Why?

This is useful for creating modpacks that you intend to release publicly, because it reduces the chance of legal issues and arguments between you and deveolopers.
I also personally don't like using all rights reserved mods, because I like to look at their code a lot, and I believe it's a bad practice to hide or restrict access to code.
One might also feel safer knowing they could read through the source code any time they like, to dispell their anxieties that there might be malware hidden inside.