Would you mind putting a proper license on them? The Free Software Foundation has a good explanation of why this is important.
(If you want to see how far that “other jursidictions” thing goes, take a look at this analysis of how far the CC0 has to go to achieve “like Public Domain” status in Germany’s “protect the creator from giving away too much” system.
(eg. Germany’s legal system prevents you from giving away rights that didn’t exist at the time you made your statement, so the CC0 includes a clause where you make a legally binding promise not to sue over rights that get written into law later.)