LGPL is compatible with Cygwin's license (GPL+exceptions)
Posted Nov 20, 2008 2:50 UTC (Thu) by dwheeler
In reply to: Cygwin
Parent article: MinGW and why Linux users should care
First of all, the LGPL is typically compatible with the GPL, depending on their versions. See my FLOSS License Slide for more information on license compatibility.
BUT Cygwin's license is special: you can use ANY open source software license, without charge, with Cygwin. You can also use Cygwin to run closed source software, but you have to pay extra for that privilege. The Cygwin license, which is the GPL plus some exceptions, is at: http://www.cygwin.com/licensing.html.
The Cygwin license says: "Red Hat permits programs whose sources are distributed under a license that complies with the Open Source Definition [See http://www.opensource.org/docs/osd/ for the precise Open Source Definition and a list of the licenses certified by OSI as conforming to that definition] to be linked with libcygwin.a/cygwin1.dll without libcygwin.a/cygwin1.dll itself causing the resulting program to be covered by the GNU GPL.
This means that you can port an Open Source application to Cygwin (TM), and distribute that executable as if it didn't include a copy of libcygwin.a/cygwin1.dll linked into it... Red Hat sells a special Cygwin (TM) License for customers who are unable to provide their application in open source code form."
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