Exchange of Information and Values Taking Privacy into Consideration - IT Enabled Services - page 196

12.4.2 Updating Contents
When the distributor wants to update the contents or change the access control
condition, it tries to communicate with the agent. Then the agent updates the
contents or meta information
12.5 Routing Based on Traces of Contents
12.5.1 Requirements of Routing
Generally, packets are forwarded based on IP address or FQDN and each packet
contains a source address and a destination address. Though many anonymous
networks have been found (Clarke 1999 ; Mambo et al. 1991 ). These system are
assumed that all entities on network are static. Therefore, we have to consider the
dynamic-moving entities because the information will be moved and distributed over
P2P network. The flood routing is a solution to this condition. However, it causes heavy
traffic and is not realistic. Another solution is to register the forwarding history in
routers. However, this solution has two problems. First, plenty of memory is required
on the routers. Second, some ID numbers are stored and this may violate the privacy.
12.5.2 Assuming Network
Another method proposed that network is composed by nodes shown in Fig. 12.4 .
A capsule contains the contents, the agent that manages the access control, and
routing identifiers. The functions of these nodes are to create, to use, or to forward
the capsule.
The entities of assuming network are as follows.
• Distributor has copyrights or is an owner of distributed contents. The owner can
change the access rights and purpose of contents. This function is important for
the controls of digital right management and privacy.
• User uses the contents and creates the second use contents. Therefore, User may
become a Distributor .
• Agent accompanies the contents and controls the content usage at the node of the
User .
• Router forwards contents with meta information. This information consists of
Agent and Trace set which is used for routing.
• Capsule is a container of the contents, Agent and Trace set .
• Uplink message is data or message transmitted from Distributor to Agent .This
message is used for updating the contents or for controlling access rights.