The PROM_PERM is a Product permissions information of each symbol. It contains the Permissionable Entity (PE) which is use for permission with the DACS server.
Each symbol is mapped to a PE which is a simply a numeric value currently in the range of 0 to 8959. This range is not limited and will expand in the future. Each PE consists of one or more symboles and is the lowest level of data that can be permissioned to an individual user.
Apart from News items, each symbol can only belong to one and only one PE.