It's quite possible that the person who created the database deliberately set it up that way. They may not want you to be able to go in and alter things.
I don't know enough about the security end of things yet, but that is the sort of thing I am looking to do, prevent the average user from having access to things they could accidentally change, that would affect the perforance of the database.
If you are like me, you like to play around with files and see how the work. However sometimes people who play around don't realize the damage they can do, and because you can't always UNDO in Access, it is in the best interest of the designer to put locks and blocks in place to protect their work.
