duff - Duplicate file finder
Copyright (c) 2005 Camilla Berglund <elmindreda@elmindreda.org>

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this software.

Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:

 1. The origin of this software must not be misrepresented; you
    must not claim that you wrote the original software. If you use
    this software in a product, an acknowledgment in the product
    documentation would be appreciated but is not required.

 2. Altered source versions must be plainly marked as such, and
    must not be misrepresented as being the original software.

 3. This notice may not be removed or altered from any source
    distribution.