I recently bought the Man-Tank (https://www.renderosity.com/mod/bcs/man-tank/122258/) and just happened to read the ownership statement.

Its a derivative work using parts of Chibi Tank, https://www.blendswap.com/blends/view/75174.

Well I was curious about that, so I went to the link and it mentions that Chibi Tank is licensed under CC 3.0 (which allows commercial use but requires attribution and a link to the license).

So the question is: does that mean only Cybertenko needs to attribute the original work, or do I need to attribute the original work as well, if I use the derivative work, Man-Tank, in a commercial animation?

FIrstly this is in no way legal advice and just my interpretation of the situation. If in doubt please seek appropriate legal advice as scenarios may change depending on numerous factors.

I would expect the Man- Tank and all of its components are sold under the Renderosity license and they are the only terms that you would need to abide by in this case as a purchaser. If you look at the Chibi Tank the CC license is Attribution only. https://creativecommons.org/licenses/by/3.0</https:> without any additional requirements for passed on license conditions.

Creative commons has a separate license called an Attribution-Sharealike licence https://creativecommons.org/licenses/by-sa/3.0</https:> This second licence also has a provision that any passed on sharing of the original material is required to use the same license as the original itself.

So Cybertenko has remixed the original and fulfilled the obligations of the original item with the attribution and is now distributing the item under a new license which is the terms applicable to yourself. Which I believe is the standard Renderosity Usage terms.

Thanks for your response Razor42, you're probably right. It would be nice to get an official response too from someone at Rendo, just for peace of mind. I'm just a hobbyist so I don't have money to consult an attorney on something like this. I do sell some of my animations at another online store, but not enough to make a living by any means. I just wanted to make sure I don't have a problem down the road so I don't want there to be any ambiguity in my use of the item.