Wow - this really is messy. Especially the part that ABC has signed Alderson, Easton, and Howarth to long-term contracts and is even willing to create new characters for them on GH:
Prospect Park issues statement on disputed GH/OLTL charactersThe things is, though, that Prospect Park is perfectly within their rights with what they're doing because, with ABC having sold all the OLTL characters to them, Prospect Park does indeed own the OLTL characters that are appearing on GH, so they have control over what can be done with them.