oh keith, where have _you_ been?
_of_course_ it's legal. perfectly so.
Really, so then it is perfectly light to take a book rip out
the copyright notice and post the book on the web for free.
Sure PG is not into making money, they want books be available for
free. PG gives books away for free. No damage done,
Yet, ...
plus it is _far_ from being unethical.
(well, some of these outfits are trying to
shut down access to free copies because
they claim copyright on their own version,
and that indeed falls on the unethical side,
but that's some whole other kettle of fish.)
educate yourself fully before you post, ok?
regards
Keith.