Licensing:Webmin

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The base Webmin license is BSD:

---------------------------------------------------------
 Copyright (c) Jamie Cameron
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
 3. Neither the name of the developer nor the names of contributors
    may be used to endorse or promote products derived from this software
    without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED.  IN NO EVENT SHALL THE DEVELOPER OR CONTRIBUTORS BE LIABLE
 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.
 ---------------------------------------------------------

However, there is also an additional license restriction (found in "PATENTS"):

Mutual Termination for Patent Action. The License for the use of Webmin shall
terminate automatically and You may no longer exercise any of the rights granted
to You by this License if:

1. You file a lawsuit in any court alleging that any software that is licensed
under this license infringes any patent claims that are essential to use
that software.

2. You file a lawsuit in any court alleging that any OSI Certified open source
software that is licensed under any license containing a "Mutual Termination
for Patent Action" clause infringes any patent claims that are essential to use
that software.

This is not compatible with either GPLv2 or GPLv3. This goes much further than the patent termination provision in GPLv3.