<listitem><para><option>Signed-By</option> (<option>signed-by</option>)
is either an absolute path to a keyring file (has to be
accessible and readable for the <literal>_apt</literal> user,
- so ensure everyone has read-permissions on the file) or a
- fingerprint of a key either in the
- <filename>trusted.gpg</filename> keyring or in one of the
+ so ensure everyone has read-permissions on the file) or one or
+ more fingerprints of keys either in the
+ <filename>trusted.gpg</filename> keyring or in the
keyrings in the <filename>trusted.gpg.d/</filename> directory
(see <command>apt-key fingerprint</command>). If the option is
- set, only the key(s) in this keyring or only the key with this
- fingerprint is used for the &apt-secure; verification of this
+ set, only the key(s) in this keyring or only the keys with these
+ fingerprints are used for the &apt-secure; verification of this
repository. Otherwise all keys in the trusted keyrings are
considered valid signers for this repository.
</para></listitem>