Patent ID: 8028339

Claim:
A network device having a first security program list corresponding to a first digital rights management method, the network device comprising: a hardware module comprising a security program management module for receiving a second security program list forwarded from another network device, wherein the second security program list corresponds to a second digital rights management method which is different from the first digital rights management method, comparing the received second security program list with the first security program list of the network device, and causing a desired security program necessary for using content of the other network device to be installed into the network device according to the comparing wherein the security program management module transmits the first security program list to the other network device to use the content of the other network device; wherein the security program management module transmits an address of a security program server providing the security program registered in the first security program list when forwarding the first security program list to the other network device, and receives an address of a security program server providing the security program registered in the second security program list when receiving the second security program list from the other network device.