This book "Mastering Machine Code on Your ZX81 or ZX80" by Toni Baker
is a copyrighted work and I expect it's (c) Toni Baker but it's not
stated anywhere.

The downloadable versions (which I Thunor typed-in) of the program
listings from the book I am releasing into the public domain (the
author Toni Baker states in chapter one "By writing your own programs,
or by adapting mine - by all means do - they are intended for this
purpose, and some in fact are deliberately improvable for this reason").

Programs that I've written for "Finishing the Book" contain my own
original source code plus material from the book and have been released
into the public domain.

All additional textual material that I have added to this work is (c)
Thunor 2009-2011 and licenced under the GNU Free Documentation License:
http://www.gnu.org/licenses/fdl.txt

All additional images that I have added to this work are (c) Thunor
2009-2011 and licenced under the Free Art License ->
http://artlibre.org/licence/lal/en

Thunor 2011-02-16