File System Security
The PSQL engine adheres to the file system security defined by the specific operating system (OS), such as Windows File Sharing.
Only the Server engine can enforce OS-level file security based on the privileges assigned to the login user name. The Workgroup product does not attempt to do this. In a small office, where Workgroup engines are most common, this can be considered a plus because they are usually short on networking experts, and the fewer barriers to successful data access the better.