I'm using an FTP exit program to limit all FTP access to only known users and IP addresses. I have also assigned them a unique User ID and password.
You have a couple of options. Since you are requiring a unique user ID for this operation, you could exclude this user ID from all of the rest of your system libraries. So the only library this user has authority to is the specific library.
Second, you could do a little more with your exit program. Part of the information you're getting includes the object being FTP'd. You could examine this information in your exit program and not allow the operation to continue if the object is not in the specific library.
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