So, even if Victor Miller wins the rights to his original script, he may not retain the rights to Jason Voorhees as we know him.
Victor Miller filed a termination of copyright over the original Friday the 13th script he wrote for the first movie, which would allow him monetary compensation for future Friday the 13th projects.
On the opposite side, Sean S. Cunningham could release movies with Jason Voorhees, but without any of the lore contained in the original script, and without the Friday the 13th title.
The legal battle over the Friday the 13th rights exists between original Friday the 13th writer Victor Miller and original director Sean S. Cunningham/Horror Inc. At this point, it’s a matter of sorting out who owns which elements of the franchise, but both sides want to control it all, if possible.