We probably have extradition treaties with those countries. And if those countries signed the Berne Convention, those jurisdictions must uphold US copyrights.

extradition != arrest

You need to habeas some corpus before you can put that corpus on a plane to America.

But isn't extradition only applicable after you have been found guilty?

Not usually, since the act might not even be illegal in the jurisdiction where you are finally arrested. Usually you're brought back for a trial and sentencing.

sorry, I was unclear and referred to a trial in the country asking for extradition, but you answer is good anyway, thanks.