Signature Display

I had enabled the point system and created a point shop on my forum
Which i sell pictures that i am going to insert into member's signature section
but to prevent other members from stealing the link and posting it on their own sig section
is there a way that i can keep signatures of all members enabled and viewable
but at the same time only administrators can edit the signature section

Not really, but you could do is make it an image in paint so that all the sigs are together and they can't get them and then add a water color on the across the page saying copyright.