It's licensed under the GPL, where you're not allowed to add any additional terms. The citation notice it spews out is annoying, but can be disabled, and you de

It's licensed under the GPL, where you're not allowed to add any additional terms. The citation notice it spews out is annoying, but can be disabled, and you definitely don't have to include it anywhere. The author just asks for citations because he's in academia, and citation backrubs is how anyone can justify getting time to do anything (including maintaining some software) in academia.