I agree wholeheartedly re: trying to police the greater internet. It's not really possible or worth our time - but that still doesn't mean our work shouldn't be defended with as much gusto as we can manage. A proper CC license would help this.
Regarding commercial use, I think it is best to ask permission from the artist or artists who created the drawing or drawings to be used.
The issue to me, of course, is that these artists would use parts drawn by the rest of the members on this site. How do we sort that out?
I do not share Colo's pessimism about SB works in published works. I've been published and I've seen other SB work printed in quite high-end quality books like Conway's Warship. If the SB drawings are reproduced in a small enough scale they don't look that bad, and with B&W reproduction they still look pretty good and indeed in many cases better than the pixelated line drawings and photos I've seen in several books recently.
My biggest complaint is that Shipbucket intrinsically is not a print-friendly format and I will never support its use by print publishers as a viable tool for rendering ships. In this age where MOST lineart and graphics are done using vector techniques, there is absolutely no reason to use a raster format. If people were to come to us trying to license artwork or pay for drawings, my first sentence to them would be to seek out an art shop that specializes in vector art.
Anyway, suitability for print aside, the biggest concern I have is just that all drawings inherently use parts drawn by the community as a whole. I'm really curious how that would work from a commercial art perspective.
Were it up entirely to me, I'd make it official policy that we do not allow any kind of commercial use just because of the weird questions it seems to generate. But that's just me, and the decision is ultimately up to Gollevainen and the community!
My issue with transferring to a NC license is that you're moving from one that is less restrictive to more restrictive, and that might run into legal troubles. As usual, IANAL.
What legal troubles would you be referring to, exactly?