Yeah, Palladium is infamously hostile to fans who even think of converting to d20, and they sic their lawyers on them. They will threaten legal action over even a message board post talking about how to convert, and no, that isn't a joke.
I know more Palladium fans who gave up buying Palladium products upon being hit with a C&D letter than fans who still buy Palladium products. Ironically, I also know more people who play the RIFTS setting with homebrew d20 conversions than people who play it with the original system, but because of Palladium's attitude about conversions online, no two groups use the same rules for it.