Google co-founder Sergey Brin has hit out at Apple and Facebook for restrictions which he claims stifle innovation and threaten the openness of the internet.
Brin, who founded Google along with Larry Page in 1998, told the Guardian the principles which underpinned the creation of the internet - openness and universal access - are under facing its greatest threats.
The threats come from Government censorship, attempts by the entertainment industry to counter piracy and restrictions by two of Google's largest tech rivals.
He claims there are "very powerful forces that have lined up against the open internet on all sides and around the world" and Brin is more worried now than he has been in the past about the future of the internet.
Despite once saying five years ago countries would not be able to effectively restrict access into the internet, Brin now concedes he was wrong.