Animaether writes: "Can copyright owners assert rights over imported goods that have already been sold once?", that is the issue before the Supreme Court in Costco Wholesale Corp v. Omega, S.A. (backstory). What's at stake is the ability of resellers to offer legitimate, non-pirated versions of copyrighted goods [manufactured in foreign nations] to U.S. consumers at prices that undercut those charged by the copyright holders.
I've never been canoeing before, but I imagine there must be just a few
simple heuristics you have to remember...
Yes, don't fall out, and don't hit rocks.