Havard asks ‘One question many have asked is the question of who really owns the Blackmoor lisence ‘ and ‘…the question to who owns the Blackmoor IP…’ in the following links:
WotC owns Blackmoor, which is either a trademark or a registered trademark product [the actual designation is unclear in my sources].
The only source of “canon” Blackmoor material is explicit to TSR/WotC publishing.
Blackmoor was originally published in 1975 by TSR and the copyright updated in 1986 when TSR returned to Blackmoor with DA1 Adventures in Blackmoor by Arneson and Ritchie. Blackmoor is featured in both the Greyhawk and Mystara campaign settings.
The others are out of luck.
The 1980 publishing of The First Fantasy Campaign (FFC) by Judges Guild, then an officially licensed provider of TSR approved material, but the FFC was not approved for use of Dungeons & Dragons so is an implied Blackmoor source.
FFCII was basically a fansite created by the author, as a place to update his ongoing campaign and is again an implied source.
While the supplements published by Goodman Games and Zeitgeist Games/Code Monkey Press were done so under 3E OGL and PI. As it stands these sources, as well as 3rd party magazines, are implied to be a part of Blackmoor’s lore, but are not actually canon, additionally; and unless noted as being an “official” articles the Dragon & Dungeon magazines information is also implied if before issues 364/159, respectfully; when ALL the magazines articles became an official source of rules and adventures with the onset of 4E.
An IP address is own by the purchaser of the site; however, WotC can sue for the dominion name or any others [e.g. Blackmoor.Mystara.us] that abuses the use one of their trademark items or infringes on a registered trademark or copyright.
As to the future of Blackmoor. The Blackmoor and Greyhawk campaigns died with their creators.
As with any campaign settings it is all up to the DM and players to move beyond the creator's original outline. Any thing else is just a reprint of that outline or fan fiction so let it be updated through Dragon/Dungeon articles, by loving fans who want to make a buck, and thus an explicit source.
Explicit and Implied definition from pandius.com/prodlist.html#BlaRef
Sorry, but I did not want to join yet another group so I answered all the post here.