Tuffy font is licenced under GPL.

Original version by Thatcher Ulrich
http://www.dafont.com/thatcher-ulrich.d1388
http://tulrich.com/

Improved version by Károly Barta (corrected the glyphs and added more characters)
http://www.dafont.com/karoly-barta.d2118
http://brtkr.blogspot.com/