Encrypt the file. If you do not want the encryption key written in the script to be accessible from outside, encrypt the browser file (xml) itself.

If you do not want to encrypt the browser file (xml) itself, create a xml file for the encryption key separately from the main browser file and define a user function for encryption in the script on the form.

Then, immediately after opening the main browser file, use AddResourceFile and OpenHiddenForm to add the form defined in the xml file for the encryption key as a background form (HiddenForm).

To encrypt, a user-defined function in the background is called.