Also, if code has no license, then apparently it's equivalent to having an "All Rights Reserved" notice, preventing any re-use of the code at all, according to http://osswatch.jiscinvolve.org/wp/2013/05/21/unlicensed-cod...
"Experienced developers won’t touch unlicensed code because they have no legal right to use it." http://osswatch.jiscinvolve.org/wp/2013/05/23/unlicensed-cod...
So if TempleOS has no license, then it may not be strictly legal to add networking support and then re-release the code. Glancing at the "Downloads" section shows no mention of a license. Of course, no one is going to be able to enforce those protections in Terry's case, but if it's likely to simultaneously offend him and be illegal, is it a good idea?
What a strange situation.
EDIT: TempleOS turns out to be in the public domain.