disabling copying in win 2003 server

Hi, I have a win 2003 server environment where I have created domain users. Once the domain users login, they are mapped to a shared folder in the server. Now I want to prevent these users from copying files/folders from this shared folder but still want them be able to read/write to the same folder as they are constantly transferring daily work to the folder. Is there a way I can disable the CD, floppies or flash-disks or any other media of copying the data? I have implemented a local active directory. Any one to help me.

Thank you in advance

Mutua.