BBC.Millions of television viewers are now using illegal file-sharing services to access free and unauthorised copies of programmes, research has revealed.
US drama Heroes was the most popular illegal download this year, according to research firm Big Champagne.
Around 55 million people downloaded the show, whilst 51 million chose to access Lost, the second most popular show.
Visits to leading "torrent" sites, which index video and music files, have also nearly doubled in the last year.
The proportion of file-sharing involving films and television rather than music is continuing to rise, the research shows.
"Millions of television viewers now access free, unauthorised versions of favourite shows at least some of the time," says Eric Garland the chief executive of Big Champagne.
"This is a socially acceptable form of casual piracy - and it is replacing viewing hours."
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All of the programmes in the top 10 were American, but the survey also examined unauthorised downloads of popular BBC show Top Gear.
During the most recent series, the figures show around 300,000 downloads of each episode in the days immediately following their broadcast in the UK.
But the UK accounted for just 4% of the download activity, with 47% coming from the United States.
Big Champagne says Top Gear has been among the most pirated television programmes internationally.
Interesting.