Jeff Zucker, on his first day as chief executive of NBC Universal, came out swinging at YouTube, accusing the online video site of failing to deploy its technology to protect the copyrighted materials of traditional media companies.

“YouTube needs to prove that it will implement its filtering technology across its online platform. It’s proven it can do it when it wants to,” Mr Zucker said, referring to the site’s controls to block pornography and hate speech. He added: “They have the capability. The question is whether they have the will.”