It doesn't necessarily have to be for sale, but open source is as open source does. The best parallel would be to look at the Linux market - the latest and greatest Linux kernel can be downloaded for nada at www.kernel.org and immediately modified and re-sold if it trips your trigger to do so. OTOH, the distros (RedHat, SuSE, Mandrake, etc) make money from one of two things: services and/or or add-ons that give value to the package as a whole. Same story here - the base mesh is free and anyone can (depending on how the license is written) add stuff to it that makes it worth selling (if they desire...) /P Right now we see folks selling textures for Kozaburo's stuff, so selling derivations of free items isn't exactly a new phenomenon.