The FRRouting project consists of parts with various licenses. Any particular file's license should be indicated at the top of the file with an SPDX License identifier. The full text of all licenses used can be found in doc/licenses. The composite work (binary) resulting from compiling FRR is thought to always be distributable under GPLv2 or later. However, please note that this is simply an expression of the community's best-effort understanding, it is not a legal statement, guarantee, or advice of any kind. If necessary, please familiarize yourself with the specifics and/or consult a lawyer. Also please be advised that FRR's documentation is, for historical reasons, licensed under a custom (but relatively permissive) license. This license dates back to the GNU Zebra project and cannot easily be changed into something more common, short of rewriting the entire documentation.