Technically? Well, the wallpapers obviously would have been distributed for anyone to use on their systems by the respective companies, as you can get those same ones off the SWTOR site. But I know that the sounds didn't come from there, so they were either pulled from the game or another one and redistributed (which I'm sure breaks it's EULA, as it usually will), or they are movie sounds and the like, or from that sound board, which are covered by copyrights, but in the case of that sound board there isn't anything saying what you can do with it (but I also notice a distinct lack of a "download" feature, which has me inclined to think you aren't supposed to do that). Some would say that since they don't appear to say you CAN'T, then that means you CAN, but that's kinda the same as claiming that shoplifting is only illegal if you're caught. The fact of the matter is, anytime you use and distribute someone else's copyrighted IP, even under completely hand made stuff (I.E. a wallpaper YOU made from a drawing YOU made, but it is of say, Boba Fett), you are still using a copyrighted IP. Which means, you could be sued, though that likely wouldn't be the first step taken anyway, it would probably be a cease and desist order. Because Boba Fett would be the IP used, and just the "intellectual" form of Boba Fett is owned by Disney or whomever. Now, how likely is someone to pursue that? Well in the case of a big corporate entity, not likely so long as you are not either profiting or competing with something THEY are trying to release. But they own the IP, so they have the legal right to do that. Copyrights are a heartless bitch, because when it comes down to something big, and multimedia, like Star Wars. Everything is going to be copyrighted, but it isn't just going to be copyrighted under a blanket set of rules. Character names can be copyrighted one way, while the character designs can be another, and even phrases, terms and dialog can have certain rules. Then the branding as a whole is copyrighted a certain way. So everything has limits to where and how it can be used, and they won't all be the same. So essentially, anytime you're making anything Star Wars (even an original character or storyline), and you use the Star Wars branding, then you are putting yourself at a risk. Now somethings fall under fair-use, but these are often super-vaguely defined, and even straying slightly from what they say is fair-use can land you in a stink. Now, how hard would they pursue any of that? Well again, it would really come down to money and how it affects them. So, would you get in trouble? Very doubtful. But can you? Yes, probably.