# [Tex/LaTex] Is it actually illegal to TeX texbook.tex?

At the top of texbook.tex, it is written:

% This manual is copyright (C) 1984 by the American Mathematical Society.
% All rights are reserved!
% The file is distributed only for people to see its examples of TeX input,
% not for use in the preparation of books like The TeXbook.
% Permission for any other use of this file must be obtained in writing
\loop\iftrue
\errmessage{This manual is copyrighted and should not be TeXed}\repeat
\pausing1 \input manmac


Does this actually mean that would be illegal to TeX this file, or is it more likely an attempt at intimidation by Addison-Wesly?

Would it make any difference …

1. … if the output were only for personal use?

2. … if the output were only used on-screen, not printed?

3. … if one already owned a copy of the TeXbook?

(Probably the answers to at least some of these questions vary from country to country.)

Also (this is probably a big can of worms), would it be wrong to do so?