imo:
1) User A is a customer of MoonHub.His internet service
provider(ISP) is MoonHub.The ISP provide the internet service to
the houshold of User A.
2) Each "Household" is issued an IP address by their ISP.
3) With this IP,the household(User A) is able to serve the net
through sending and receiving data bytes from MoonHub.
4) MoonHub, since they manage the houshold's internet usage, will
know what kind of websites User A visits and what kind data is sent
and received by User A.
5) Theoritically, MoonHub is not authorised to release this
information to RIAS but they have to release it to the police
authorities upon request.
6) RIAS makes a complain to the police, saying someone has
infringed the Intellectual Property law. The police checks with
MoonHub and monitor the suspect's internet usage. Police finds out
the household with the IP address 192.1.1.1(User A houshold) is
downloading illegal songs. Thru tracing the IP address 192.1.1.1,
the police will know from MoonHub which home address is this IP
allocated to.
7)viola...police comes knocking on your door.
the above names have been changed to protect identities...
