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3. License Classifications
3.1. Open Source
With one possible exception, we believe that all of the code in this release (4.4.0) of XFree86 meet the requirements of the Open Source Definition, as maintained by the Open Source Initiative (OSI).
The one exception is a file containing font decompression code (xc/lib/font/fontfile/decompress.c) which contains a licence that does not explicitly give permission to make modifications. This file has been part of the X11 sample implementation since at least X11R5, and has been present in all versions of XFree86.
3.2. Free Software
We believe that most of the code in this release (4.4.0) of XFree86 meets the requirements of the Free Software definition as defined by the Free Software Foundation (FSF).
The exceptions, aside from the font decompression code mentioned in the previous section, are the GLX extension and CID font code that are covered by the SGI Free Software License B, version 1.1.
3.3. GPL-compatible
The client-side X libraries distributed with this release (4.4.0), with the exception of the GL, GLU, and GLw libraries, carry a subset of the acceptable licenses that satisfy an additional condition: they are GPL-compatible. The GL, GLU, and GLw libraries contain code covered by the SGI Free Software License B, version 1.1, which is not GPL-compatible.
Other portions of XFree86, including the X servers, may include code with licenses that are not GPL-compatible. Example of such licenses include some of the BSD-style licenses, the FreeType License, the SGI licenses and the XFree86 License version 1.1.
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