Samples copied from BRL's BlitzMax project and adjusted for BMX-NG. https://github.com/bmx-ng
BlitzMax-NG samples are, if not released into Public Domain, released under the zlib/libpng license.
So the samples just use the same licence the original BlitzMax-project got released under when BRL released the sources on github.com: https://github.com/blitz-research/blitzmax