Who owns the Dragonlance intellectual property?

This answer states that Margaret Weis “owns” Dragonlance, and that she “won the rights to Dragonlance in a court battle.” Is this accurate? I could not find any details of such a court battle, or indeed anything corroborating the assertion that Weis owns Dragonlance, from searching the Internet. Or does Wizards of the Coast still own Dragonlance?

Note that a license to produce products using an IP, and the IP itself, are two different things.