boost::optional<dcp::EncryptedKDM> get_kdm_from_url (boost::shared_ptr<DCPContent> dcp);
boost::optional<dcp::EncryptedKDM> get_kdm_from_directory (boost::shared_ptr<DCPContent> dcp);
boost::optional<dcp::EncryptedKDM> get_kdm_from_url (boost::shared_ptr<DCPContent> dcp);
boost::optional<dcp::EncryptedKDM> get_kdm_from_directory (boost::shared_ptr<DCPContent> dcp);