A NYC filmmaker named Daniel Risdon is currently sueing Disney Productions and "Tron" screenwriter, Steven Lisberger, charging copyright infringement.
Risdon maintains that "Tron" is based on the plot of "Megalopolis, The Computer City", a screenplay he wrote in 1977.
Supposedly, Risdon showed the script for "Megalopolis" to Lisberger, and he states that "Tron" contained several essential elements from his play "disguised within the formula plot."
Risdon is asking for $14 million in damages, as his share of the profits from the movie and book sales published by Simon & Schuster and Ballantine Books.
