[greenbag]

No, nothing in the GPL prevents you selling boxes or adding addons. However our trademark policy does prevent this, if the selller is using the term "Kodi" or our logos.

4.3 in your policy says they need your permission before distributing with add-ons.

"4.3 Add-ons, Skins and other extensions
At the same time as we seek community involvement in the development of the XBMC Foundation products, we want to protect the reputation of these products as high-quality and lightweight, with simple, usable interfaces. If you want to ship add-ons, skins or other extensions installed by default or as part of the same installation process as the XBMC Foundation products, and you plan on distributing them under any XBMC Foundation Marks, you must first seek approval from us. What we find acceptable will depend on the effect of the add-ons, skins and other extensions on the XBMC Foundation product. To give examples, changing the skin of one product to another, equally high-quality and aesthetically pleasing skin would be considered. A combination of various add-ons with intrusive pop-up boxes, with loud and distracting UI sounds, probably wouldn't be. See our Partners page to find out more about contacting us to discuss your proposed changes."

Yeah.....it has nothing to do with GPL, the trademark covers this. He was just making a correction.

Yeah.. I got them mixed up.