advice regarding printing / stealing images

Helo guys,

a friend of mine asked me to print one of my picture, he want s to hang it on the wall.

I wanted to make a gift for him for his BD, but suddenly i thought about one thing.

How do you guys deal with your pictures file when you print?

aren't you afraid that whom you send it too, keeps your file / files and start selling your pictures ?

How can one avoid this possibility besides printing it myself?

What do you guys do?

I have one picture in particular that a lot of people think it's special, and it is probably worth a lot of money, because is a once in a lifetime shot

I am afraid if i send it to print it is going to be stolen.

Any advice would be greatly appreciated

thanks

matteo

P.S. btw the picture was taken with my 5d2