In his first interview since being sued by Marvin Gaye's family, Williams said it could mean other musicians face similar legal action.
"The verdict handicaps any creator out there who's making something that might be inspired by something else. This applies to fashion... Anything," he said.
"If we lose our freedom to be inspired we're going to look
up one day and the entertainment industry as we know it will be frozen in litigation. This is about protecting the intellectual rights of people who have ideas," he added.
The judge agreed with the family's claim Gaye's "Got To Give It Up" was copied by the pair's "Blurred Lines" hit.
"Blurred Lines" was the biggest hit of 2013, selling millions of copies worldwide.