>What remedies are available in those countries that have no concept of
AFAIK you simply have to be able to establish that you originated the work.
With written material, a suggestion which I have received was to send a
copy of the work to yourself by registered mail so that an "official" date
is established. A cheaper and possibly less legally watertight method would
be to send a copy to someone you trust and ask them to make sure they keep
it. You then have some sort of corroboration to your claim from another
Rob Geraghty email@example.com