How to disable copy in shared folder

Ask the RIAA and MPAA how they're doing on this "read but not copy" issue with digital data.

Seriously, making data un-copyable is like making water not be wet. Data is copied around your computer and transformed dozens of times just to display it to the screen, or output it to your speakers.

The more recent cracks of Apple's "FairPlay" DRM system involved intercepting the raw data during transformation, after it had been decrypted, but before it was sent to the speakers.

I hate to say it, but give up on this concept. It's just not possible.

Read only access means that they cannot modify the files in place, but can view them. Because they can view, they can copy, and modify that copy, but they cannot put the modified copy back on the share if it is read-only. There isn't any way around this.

Imagine it was a word document - read permissions provides the access to open the file in Word, but obviously there can't be a mechanism to stop them Saving As.