As David Mamet said, “There is no Net.”
This really came out in the Art Buchwald “Coming to America” plagiarism trial.
Jim Garner is another one who had a % of "The Rockford Files" and couldn't understand why he never saw a penny even though the show ran in syndication and overseas for decades. He fought an extraordinary battle to get to Universal's "third set of books" and finally won after years and years.
Its always a gamble to launch these fights because the studios will do their best to make sure you never work again.