You have, I hope, already seen the Flash movie explaining Creative Commons. The movie is distributed under a Share-alike CC licence, which means you’re not only allowed to mirror the file yourself but also allowed to create derivative works.
Of course, it’d be a hell of a lot easier if they’d remembered to post the bloody .fla file.
(Oh, and sorry for the delays. Tons of stuff to post but way too busy at the moment, what with Limmud approaching. Hopefully, will be catching up after Xmas. Byeee.)