It is my understanding that there is no cost for copywriting--you simply
state that the item is copywrited and that it may not be copied.  *Defending*
your copywrite would cost money, you would have to take someone to court for
using something you had copywritten.

I am not a lawyer, so cannot say for sure this stuff is correct, but I know
where I used to work, we used to copywrite stuff simply by stating that it
was copywritten.

susan