Permission to use, copy, modify, and/or to distribute the works is granted,
provided that all copyright notices appear unchanged in all copies; but also
that the origin of the works is not misrepresented; and last that modified
versions of the works are not misrepresented as being the original version. 

The works are provided 'as is'. The authors disclaim any warranty whatsoever. In
no event whatsoever are they liable for any damage in any regard with the works.
