CEOP releases film about online safety for children
8 February 2011 Last updated at 02:48 GMT
A new drama by the Child Exploitation & Online Protection Centre (Ceop) warns children about the dangers of uploading material to websites.
It features a girl who sends her boyfriend photos of her naked.
He forwards them to a friend and the images are posted on a website.
The aim is to limit the amount of "sexting" carried out by teenagers.