shithub: sox

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SoX source code is distributed under two main licenses.  The two
types of licenses are described in detail in the files
LICENSE.GPL and LICENSE.LGPL.

sox.c, and thus SoX-the user application, is distributed under the GPL.

The remaining files that make up libst are licensed under the less 
restrictive license LGPL.

There is currently only one exception to this.  The files FFT.c and
FFT.h are original from the Audacity program and fall under its
license of GPL.  The noise profiling and noise reduction effects
both make use of this FFT code and would need to be removed from
any program that requires LGPL only software.