In general, the above advice is pretty good. In terms of trying to get a handle on all of it, I would suggest breaking the large question into 2 parts. The first part is copyright law. Kevin largely sums it up, and from some of the terms he uses, I suspect he is a lawyer or plays one on TV. If you want to understand in detail what rights the creator of a work has, a good place to start is the U.S. Copyright Act. You can find it, as well as explanations of it, linking from www.findlaw.com The second part deals with the fact that the copyrighted works Poser folk are most concerned with are considered software (for example, an .obj file). Most software is licensed to users, which means the user's rights are governed by the terms of the license. For example, if you bought MS Word, you would have the right to make a backup copy, but not to distribute copies to everyone you know. And you could develop software that works with Word (assuming MS folk haven't designed incompatibilities into their program...). In the case of DAZ product, it would appear that if you make a "derivative work" by morphing Posette, Vicki, etc., they grant licensees (you) the right to distribute the changes, so long as you do not distribute copies of their original work. DAZ3D does not seem to have raised a problem with the distibution of morph targets for individual parts, but PhilC is right that you would need to use Mover to encode items that embody more of the original work. Jim Burton is also correct in his hypothetical example, and in explaining why it almost purely hypothetical. Someone could make a morph target from other morphs that are freely available for any use (such as Trav's at MorphWorld, if I read his readme file correctly). But someone doing so is likely to do so by spawning the combined morph, which makes reverse engineering of the sort hypothesized by Jim difficult. And as long as I have mentioned Trav's readme file, I would note that, as Jim and Mehndi suggest, that the creator usually includes a readme file in their DL file that explains the terms of use. Usually, the free stuff specifies that personal use is okay, but commercial use requires at least permission of the creator. An example of this is the readme that accompanies stuff DLed from Kozaburo and Yamato. But Trav and Darth Logice seem to be okay with commercial use; some of Angielyn's free stuff can be used commercially, but the textures generally cannot be made available for resale, DL, etc. As you can see, it varies, so check those readmes. And giving credit where credit is due, even if you have permission for use, isn't necessarily legally required, but is always always a good rule of thumb.