I was just about to post that I found the simplest way to
protect/unprotect the sheet for data  entry into the database, but
the code  contains the password and the code is viewable and
editable. Is there a way to hide this? I was looking at encryption,
but I don't really understand how that works.

The users, just fyi, are engineers from varrious disciplines,
including cs. I would like to protect this using zimmerman's pgp,
but that would probably defeat the purpose.

Ay suggestions?