isn't the skin base tilt is using the HTC default (made by Greebo?)? I can see that bitmap when I "save default," so I'm sticking with HTC's published permission to modify as I see fit, so to speak. I'm unsure as to the validity of your claim that this particular bitmap is "unmodifiable."
i see two fairly comparable la5 skins in the "default" and greebo's 229IAD skin... only minor modifications in some of the camo areas and maybe a few scuffs tidied up here and there. the most notable difference is... the markings.
now disregarding the fact that greebo also did the 229IAD skin, anyone with a modicum of skill (still more than i possess) could have put the 229IAD markings on the Default and submitted it. Sort of like what Tilt is doing, no? And exactly what Greebo apparently did.
I dunno where Tilt got the base skin to work with, but if it was from "HTC" then i see no plm with what he is doing. If Tilt got it from AH-Skins, then I guess Greebo needs to reconsider his modus operandi and bring it more into line with yours.
the point being, I think greebo (and to a lesser extent, initially, you) are getting your noses bent out of shape in regards to Tilt who was very forthright and upfront (unlike some of the others you've alluded to.)
Point remains, if Tilt is working from the HTC default skin, you have no valid claims. If Tilt is working from something Greebo put up on AH-skins or something, he was never less than upfront about it, nor wanting to steal Greebo's thunder.
again.. anyone can modify whatever .bmps found in the default skin... *any* .bmp and it's up to HTC to accept or not.
Tilt never did anything wrong in my opinion, and from a legal standpoint none of you skinners have any actionable claims. if you're scared about someone "stealing" your work, don't share the actual files with anyone, this includes posting them on AH-skins (sure, post screenies, but not the actual files). this way, as fencer says, skinners work is more protected from "abuse" since they'd be inaccessible.
And bear in mind, if you post those files for off-line use, then someone just may plagarize your work. good luck proving it, tho' it'd take little more than different markings, or a few camo line/color adjustments to make it "different" enough, if you even had the foresight and legal protection of copyrighting your "off-line" files.