how do you keep solar cells from being stolen ?

[lightspeed]

i saw this simlar post on another forum and what they are talking about is on a raised roof of a van , i had also thought and wondered about the same thing as some people will steal anything that isn't nailed down ! here is a link to the other forum and what they said .
But would like others opinions on here to .
http://www.cheaprvlivingforum.com/post/ ... ls-5899572