The invention relates to applying novel photo polymers based on special urethane acrylates as writing monomers in printing methods which are suitable for producing holographic media, in particular for the visual display of images. The server is configured to divide the content into multiple segments, to create multiple data streams using the segments of the content, and to transmit each of the data streams via a respective multicast session, wherein a copy of each of the multiple segments is transmitted during a single time slot of the multicast session. The inner layer can be provided on the innerside with a layer of a thermoplastic adhesion-modified elastomer composition. Additional embodiments include calculating an overall cybersecurity risk score for the entity based, at least in part, on the calculated security score and the weight assigned to the calculated security score. A flow connector composed of at least two tubular parts which can be plugged one into the other, locked and sealed, can include a partitioning wall extending in one of the parts.