non-repudiation: the problem
were sufficient packets delivered on time?
- why should receivers admit they were?
- why should sender/network concede they weren't?
multicast - heterogeneous delay & loss
applications
- real-time packet audio, video - verbal contract
- high value information - financial etc.
woolly solutions:
- call customer service and argue
- competition
- would AcmeISP lie? GlobalBigTelCo?