Hi,

We have sharing drive, we let many users to open the files, but we don't want to let the users to delete, copy, and paste the same files.

How can we lock it out?

Just hide the files, but it is not efficient, the user can unhide it. I don't know.
Can anybody suggest about it?

Thanks.

This will depend on how your network and in particular your policies and groups are setup.

If you right click on the shared drive > properties > security you see the way can permmission for certain groups, so if all your user are part of a group say called \\your office\users then you can add them (or edit if they are already there) to only have read and execute rights only.

But, will there be lock to delete/copy/paste file permission on the specific file only?

Thanks.

One way is right click > properties and tick the read only check box on the file - only users with admin right could change this, so if you'd have to be a admin to do this.

Now there is an alternative Sharepoint (http://www.microsoft.com/technet/windowsserver/sharepoint/default.mspx) you'll need a web server but it's specifically designed to allow sharing editing and document management.