Description PD stands for 'Projector Data'. The Hologram PD has all that is needed to project the data it contains, but it lacks the 'reader'. To be able to read it, a Hologram Camera has to be connected to the PD. NOTE: Universal laws prohibit private projection of holograms in public, though anyone can ask permission to run hologram shows during festivals and the like. Excepted from the rules are live-entertainers and the agent profession.