firewall to protect a community of devices, participant system apparatus and method for updating firewall rules within the system.

Firewall system (1115) that allows providing security to a community of interconnectable appliances (1.5 - 1.13) sharing a set consisting of at least a rule of common global security, each device (1.5 - 1.13) community (1.1 - 1.3) means (2.1) for storing a local security policy consisting at least in rules of global security, a list of community members (1.1 - 1.3) as well as their connection status, and list of services offered locally, including a plurality of devices (1.5 - 1.13) of the community (1.1 - 1.3) a filter (2.6) for messages destined for and originating from the network to which are connected, wherein the system It does not include centralized means, and that it has on each apparatus (1.5 - 1.13) community (1.1 - 1.3) local means for calculating rules (2.5) used by the filter (2.6) depending on the local security policy .