How can I "unlock" a file on Illustrator CS3?

watusa

New member
Hi. A supplier sent me a file of packaging artwork to make changes via an ftp site and although the file opens perfectly, I can't change anything because I get an icon of a little pencil with a slash through it no matter what I try to do. Do I have to unlock something? Or ask the supplier for a new file?

Thankyou !

B"H
 
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