Hi by the hook,
I'm not 100% sure of the answer, but our Jewelry Making editor, Faith, is selling an ebook on copyright (for $5.49) which talks about exactly this kind of thing. She's marketing it to jewelry artisans, but the same rules apply to crochet.
Here's the link:
http://www.bellaonline.com/ebooks/ebook45 Otherwise, you might want to just ask her by posting in the Jewelry Making forum or dropping her an email. She's become sort of an expert on this kind of thing.
The Wheel is beautiful - and looks very difficult, I must say! <img src="/images/graemlins/smile.gif" alt="" />
Chris