Last updated:聽26 february, 2010 - 16:32 GMT
Erasing David
When British film maker David Bond received a letter informing him that his daughter Ivy was among 25 million children whose personal details including, names addresses and dates of birth had been lost by the government's Benefit Office, he was worried.
Amid growing fears about how such personal data can be used against you, he decided to find out how much private companies and the government know about him.
He attempted to disappear, but asked a team of private detectives to try and track him down using centrally held data.
Leaving his pregnant wife and young child behind, he set out on a month long journey hoping to evade the detectives.
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You can find out more about David's film Erasing David here: