COUNTERFEIT DVDs with a retail value of more than £3,500 were seized during a raid at Whitley Car Boot Sale.
Sunday's early morning swoop netted nearly 300 copied discs, as well as a quantity of suspected fake clothing.
Four people are due to be interviewed by North Yorkshire Trading Standards officers, while seven others were warned about their behaviour.
Police also spot checked 62 vehicles, handed out six fixed penalty tickets for motoring offences and seized one car, which had no insurance.
The crackdown was part of Operation Impact – a multi-force blitz on cross border crime.
Town-based police sergeant Kevin Brighton said 20 officers from North, South and West Yorkshire were joined by trading standards chiefs and customs officials for the covert operation.
He said: "We're really pleased with these results because the amount of goods recovered was relatively low. It shows the market staff are on top of their game and won't tolerate the sale of fake goods."
He added: "Selling counterfeit goods is something we will continue to look at. People should be aware we will be re-visiting Whitley and other sites in the future."
