Makefile, and config.mk are on the public domain. bin/, include/, lib/, sys/, usr.bin/ come from OpenBSD with small modifications to port to Linux. includedir/ come from OasisLinux includedir/sys/compat.h taken from https://github.com/aperezdc/signify Each patch written by me is distributed under the terms of the license of the upstream project to which it is applied. Similarly, any resulting binary artifacts produced using this build tool retain the original licensing from the upstream projects. I do not make any additional copyright claim to these artifacts.