Wikipedia founder Jimmy Wales explains 24-hour shutdown
17 January 2012 Last updated at 17:01 GMT
The English version of Wikipedia will go offline for 24 hours on Wednesday, in protest at proposed anti-piracy laws in the US.
The encyclopedia's founder, Jimmy Wales, is opposing the "Stop Online Piracy Act" that is being debated in Congress.
He told Radio 5 live's Tony Livesey the anti-piracy law would be a form of censorship.
To hear other 5 live interviews, please visit the best bits page.
Tony Livesey broadcasts Monday to Thursday 2230 to 0100 on Radio 5 live.