Tuffy font is licenced under GPL.<br />
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Original version by Thatcher Ulrich<br />
http://www.dafont.com/thatcher-ulrich.d1388<br />
http://tulrich.com/<br />
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Improved version by Károly Barta (corrected the glyphs and added more characters)<br />
http://www.dafont.com/karoly-barta.d2118<br />
http://brtkr.blogspot.com/