GNU ccRTP is free software (see http://www.gnu.org/philosophy/philosophy.html. It is licensed under the terms of the GNU General Public License, See GNU General Public License, plus a linking exception, See GNU ccRTP Linking Exception.
The linking exception is the same that is used for gcc libstdc++. This was done in the case of libstdc++ because the language of the LGPL is neither clear nor correct if one uses C++ features such as templates and method implimentation directly in headers, as the division between the C++ library and another's application is no longer purely a linking one. From the practical standpoint, the exact effect is the same as the LGPL, but with language that matches these C++ features. This is all explained at http://gcc.gnu.org/onlinedocs/libstdc++/17_intro/license.html.
This manual is licensed under the terms of the GNU Free Documentation License, See GNU Free Documentation License.
There are several ways to get GNU ccRTP, refer to http://www.gnu.org and http://www.gnu.org/software/ccrtp/. The development of ccRTP is hosted at Savannah http://sv.gnu.org/projects/ccrtp/.