15 Years ago we - the kids- thought that if you download something of a BBS or got something from a warez CD, it was legal to install it as long as you removed it within 24 hours of installing. Of course, nobody did.
And of course that's a whole lotta BS
So the problem is education on the matter and if kids do something for several years because they were taught to do it's going to be hard to make them believe otherwise.
Start at the school. Teach then what is illegal.