Ok so if i make a plugin which i dont intend to make free...i mean so if i install it on a WP blog ...can it be replicated without my permission? i mean like as in if i install a plugin for my friend.. can he at a later time copy the files and install to his other WP blogs as well?
Yeah, he could copy the file right off the server and install it on others and even distribute if he wanted. But, he's your friend, a real friend wouldn't do that, right?
as long as he does not have access to the direct files he wouldnt be able to, however there is nothing stopping him from creating a clone of it.