So, no, I haven't any permission, but I'm mentioning ALL THEIR NAMES. I can't do it via Nexus, because I'm banned for ever because Nexus team are SUPER IDIOTS and can't understand simple things (when I gave my side's story for that silly accusations on me) - they 'demanded' to remove that mod (a huge 'Clutter Collection' I spend a summer to create) or (they threaten me) ban me! I gave them the 'middle finger' and told them to go to hell!. or I don't have their Facebook profile to contact them! But!!! Huge 'BUT'! I included MANY OTHER textures from ALL THE MAJOR artists, all these notorious/famous creators we all know and using their work! And no, I haven't 'got any permission from them', since I don't have. I included ALL my textures mods I've already created (in Nexus site or afterwards in my site), but I ALSO INCLUDED TEXTURES I NEVER RELEASED BEFORE. This mod/mods are a COLLECTION I made all these (long/many) years I'm daily dealing with Skyrim SE. I also want to clarify this AGAIN, here, as I did already in my site:

I just like to inform you I updated the mod (mods! They are 13 of them!) by replacing some textures or re-creating some (especially the 'Sky' & 'Effects' folders, I fixed the 'seams').

Skyrim texture overhaul mods