I don't know to be honest. I did this particular job on a personal rifle that won't ever be sold. My understanding is what I do with someone else's logo on things that'll retail is subject to lawyers, courts, and all the nasties that go with it.
What I put on my own stuff is my business as long as I don't try peddling it or coining it as my own chit.
Really no different than if I put a sticker on the side of the stock that said the same thing. If I started making the stickers and selling them that'd be another story.
That's my story and I'm stickin to it anyways.
As far as the Eley logo goes, that gun belongs to Ms. Cathy Winsteadt. Two time world silhouette champion, personal friend, and representative for Eley ammunition. I never asked them for permission either when I built that gun and I've yet to get any sort of static for it. That was five years ago.
The Marvin the Martian character is also an exclusive to my personal rifles. I've never done anything like that on a customer gun.
Once I built a bench gun for a guy who wanted the POW/MIA insignia/logo engraved into the barrel. It was a "theme" gun of sorts. I did all kinds of goofy stuff to that thing. We did contact that agency prior to doing any of the engraving work and they endorsed it so long as I didn't alter their imagery. I had to delete a little detail because a #1 Center Drill can only cut so fine a line clearly, but I stayed with the image as much as possible.
Probably more info than you wanted, but hopefully I answered your question.
Chad