I'm not talking about something like Kingdom Hearts, which is entirely owned by Disney (including original KH content like Sora, Riku, etc) and the direction the series goes in is pretty much up to them. I'm talking about things like...
Shin Megami Tensei - the original game was based on a series of novels known as Megami Tensei: Digital Devil Story. The original licensed game on the Famicom was first released by Namco. Atlus had the rights when SMT1&2 were re-released on the SNES. Now it's Atlus's main IP and they do whatever they want with the property.
Parasite Eve - the game by Squaresoft was adapted from the
novel of the same name. PE for the PSX got a sequel, also released by Squaresoft, and now with The 3rd Birthday releasing, I assume Square Enix can do whatever they want with the property.
Strider - as far as I know, the original game was based on a manga. Now Strider is an established Capcom character, and Capcom can do whatever they want with the IP. He appeared in both Marvel vs Capcom 2 and Namco x Capcom under the Capcom side.
There's also Super Mario Brothers 2, which was based on
Yume Kōjō: Doki Doki Panic, and Tales of Phantasia, based on the unpublished novel
Tale Phantasia, but both of those games don't fit into this particular list because of various technical reasons.
Now, my question is this, particularly for the first 2: how can this legally happen? Do the original authors of "Megami Tensei" and "Parasite Eve" really have no say in what Atlus or Square Enix do with the IP's? Does Japan have different legal ownership laws than America or something?
