Tuffy.ttf comes from the website of Thatcher Ulrich, 1/7/2007:
http://tulrich.com/fonts/

The description on the website:

  Public Domain Fonts

  Here are my dabblings in font design. I have placed them in the Public
  Domain. This is all 100% my own work. Usage is totally unrestricted. If
  you want to make derivative works for any purpose, please go ahead.

  I welcome comments & constructive criticism.