The Rubber Band Library is available in two editions:
The Free Software edition is available for download
from this site (see here) and is provided to
you under the GNU
General Public License, version 2 or later. You get the source
code and the right to modify and redistribute it, provided that you do
so in a work that is similarly licensed with source code under the
GPL. Rubber Band Library uses FFTW and libsamplerate to do Fourier transforms and
resampling; these libraries are also published under the GPL.
The commercial edition is available for use in proprietary
software applications. With the commercial edition you obtain the
source code with the right to modify it if you desire, along with 12
months of updates. Optionally (although at a small extra cost) we can also provide ready-to-use binary libraries for
your preferred platforms: Win32 and OS/X
are available.
The commercial edition contains essentially the same
source code as the Free Software edition, but provides more
flexibility in build environment and library support, including
support for Intel Integrated Performance Primitives and Apple
Accelerate/vDSP frameworks as alternatives to FFTW and libsamplerate
(though these are still supported if you have commercial licenses for
them). For pricing and more details, please contact us.