Mu License
http://c2.com/cgi/wiki?MuLicense=
"If you are asking what license this software is released under, you are asking the wrong question."
Mu (negative) - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Mu_(negative)
"The word features prominently in Douglas R. Hofstadter's 1979 book, Gödel, Escher, Bach, where it is used fancifully in the context of discussions on symbolic logic, particularly Gödel's incompleteness theorem."