A scalable approach for subscription-based information commerce

We consider an information commerce environment where clients subscribe to information objects sent via a broadcast onto a shared network (e.g., wireless, LAN, the Internet). In this context, a client should only be able to access its objects of interest for its subscription period, and the security system used must not be easily broken. Existing systems fail to perform well with increased client loads. We propose a new system, Drop Groups, and show that it is scalable.