Microsoft hasn't so much "released" it as a few of their
engineers have sort of put it up there where people like our
correspondent can stumble across it. It just takes a little
grepping to turn up the GNU license throughout the source, though.
Just download the file msripv6-fnord-1.5.exe, use the standard
unzip util you'll find available in your distro, and run
grep -rl GNU Source/* for a list of the files that at
least contain the expression "GNU," most of which seemed to contain
the standard copyleft notification within.