You can password-protect workspaces, custom formats and custom transformers. Double-click the Password parameter and enter a case-sensitive password in the dialog that appears. Each time you try to open the workspace, you will be prompted for the password. If you save the workspace under a different name, the password protection will also be duplicated.
WARNING: When you create a password-protected file, make sure you use a password that you can easily remember. If you lose the password, you cannot open or gain access to the file.