FreeBASIC编译器（fbc）根据GPL许可证发布。

除LibFFI（用于Threadcall）之外），运行时库（libfb）将在LGPL许可证下发布，用于单线程和多线程版本，具有此扩展以允许链接静静地：

“作为一个特殊的例外，这个图书馆的版权所有者可以让你将这个图书馆与独立的模块链接起来，以生成一个可执行文件，无论这些独立的模块的许可条款如何，并根据您的选择条件复制和分发所生成的可执行文件，只要您还为每个链接的独立模块满足该模块的许可证的条款和条件。一个独立的模块是一个不是从这个库派生出来的模块。如果您修改此库，则可能会将此异常扩展到您的库的版本，但是没有义务这样做。如果您不想这样做，请从您的版本中删除此异常声明。

Gfx库（libfbgfx）根据LGPL许可证发布。

LibFFI根据以下许可证发布，网址为http://github.com/atgreen/libffi/blob/master/LICENSE：

libffi - Copyright (c) 1996-2011 Anthony Green, Red Hat, Inc and others.
See source files for details.

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
``Software''), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

该文档根据GFDL许可证发布。