> PI holders must maintain an up to date e-mail address with the RIPE
> NCC. If they do not, the PI space will be returned to the unused
> pool.
How do you know if it's up to date - or even listened to? Best way is a
contract that says they pay a sum yearly. If the cheque doesn't arrive,
or
bounces, you take the space back. A small sum like €100/year would
suffice.
i will give you 10000 bucks and during 100 years it will not what your
problem, what the block became.