Introduction: Active Network: The Base for Content Distribution and Network Security in d-Commerce Environment

Speeding up of mobile internet bit-rate, rapid deploying of fiber accesses, and digitalization of terrestrial TV Broadcasting, by those, broadband-ubiquitous communication environment for d-Commerce (digital commerce) is coming mature very quickly. With this and advanced network function make everyone a broadcaster, namely, "Personal Broadcast". Moreover, metadata is now playing a key role in every social and business activities, thus metadata themselves are now becoming content, namely "Metadata Content". Environment above mentioned forces everyone to make content, thus we foresee that content creation and distribution would be a next carrier for industries in 21st century. Because of this ambient environment for content, particularly moving pictures, new business models of content distribution are appearing now besides conventional "On Demand Model" for entertainment content. They are "Private Distribution Model" and "Commercial Distribution Model". "Private Distribution Model" corresponds to "Personal Broadcast" and "Commercial Distribution Model" corresponds to "Metadata Content" respectively. Most important technologies for both models are Intelligentflexible Multicast and DRM: Digital Rights Management which includes Network Security Technology as its basic infrastructure. In order to achieve above mentioned IntelligentFlexible Multicast and DRM on Secure Network, followings are the points to be considered;