MacWorld is reporting that Italian media conglomerate Mediaset Group has sued Google’s YouTube for €500 million (US$780 million). The suit alleges that the video-sharing site hosts thousands of pirated video clips that Mediaset owns the copyright for.

“The suit, filed in civil court in Rome, names both YouTube and parent company Google,” the report said. “Mediaset operates television stations in Italy and Spain and produces films and TV shows. Its vice chairman, Pier Silvio Berlusconi, is the son of Italian Prime MinisterSilvio Berlusconi, who is also a media tycoon.”

The company found that as of June 10, there were 4,643 Mediaset-owned video clips on YouTube, the report said, totaling more than 325 hours of material. YouTube, of course, is still battling a $1 billion lawsuit with Viacom.

“Lawsuits like this one threaten the way people legitimately exchange information, news, entertainment, and political and artistic expression over the Internet,” YouTube said in a statement. “YouTube respects copyright holders and takes copyright issues very seriously.”