This copyright notice seems free enough, as I can see they don't want any responsibility but do want credit for their work. Fair enough I think. :-)
Is this ok for Debian? /* * Copyright 1992 Purdue Research Foundation, West Lafayette, Indiana * 47907. All rights reserved. * * Written by Kevin S Braunsdorf, [EMAIL PROTECTED], purdue!ksb * * This software is not subject to any license of the American Telephone * and Telegraph Company or the Regents of the University of California. * * Permission is granted to anyone to use this software for any purpose on * any computer system, and to alter it and redistribute it freely, subject * to the following restrictions: * * 1. Neither the authors nor Purdue University are responsible for any * consequences of the use of this software. * * 2. The origin of this software must not be misrepresented, either by * explicit claim or by omission. Credit to the authors and Purdue * University must appear in documentation and sources. * * 3. Altered versions must be plainly marked as such, and must not be * misrepresented as being the original software. * * 4. This notice may not be removed or altered. */