This is the 14117th most frequent German word.
geschützt
Protected.
Here, 'geschützt' is used as an adjective to describe the state of the natural area being safeguarded.
Dieses Gebiet ist ein geschützter Naturraum.
This area is a protected natural space.
In this sentence, 'geschützt' is used in a passive construction to indicate that the documents are secured by something (the password).
Die Dokumente sind durch ein Passwort geschützt.
The documents are protected by a password.
This usage shows 'geschützt' in an active, personal context, indicating the speaker's state of being covered or shielded by the umbrella.