Patent ID: 8150312

Claim:
A system for conveying digital media items to mobile recipient devices, the system comprising: a cellular network; an administration system in communication with said cellular network; a plurality of mobile recipient devices capable of communication with said administration system via said cellular network and with one another via an ad-hoc wireless network; each recipient device being controlled by a digital media application to: i) receive said digital media items from, and forward said digital media items to, one another using said ad-hoc wireless network; and ii) send messages relating to incentives for receiving and forwarding of said digital media items in said ad-hoc network to said administration system using said cellular network; wherein said administration system comprises: at least one digital media generation platform having a content creation engine; a metadata inserter adapted to insert metadata representative of at least one aspect of the digital media; a signature generator operative on the message to derive a signature; and a trusted authority in secure communication with the or each digital media generation platform to hold signature information; and wherein said digital media application controls said media device, such that on receipt of a digital media item at the mobile device via said ad-hoc wireless network, authentication of that digital media item is sought through cellular network communication between the device and the trusted authority, and only on said authentication being provided is said digital media item presented to a user of the mobile device.