"Using addresses from a PI block to number other parties' devices is permitted as long as these devices are connected to the same network, documentation about the usage can be presented to the RIPE NCC, and full responsibility for the addresses (abuse handling etc) is done by the PI holder".
Such a long explanation! Right now it says this: The PI assignment cannot be further assigned to other organisations. How about changing it like this: The PI assignment cannot be further assigned to other organisations unless their network infrastructure is wholly contained within the same building as the applicant for a PI assignment. If the word "wholly" seems to old-fashioned, replace it with "completely". Or you could say The PI assignment can be used for any devices connected to the network on the PI applicant's premises such as a data centre, regardless of who owns and controls those devices. --Michael Dillon