Every interaction with multimedia contents in various application domains can be called an Event. Arising from an each Event, there is the opportunity to describe what occurred. However, there are a number of difficulties in providing an accurate report about an Event. Different observers of the Event may have vastly different perspectives, needs, and focuses. They may emphasize certain elements to the detriment of others, or they may describe an Event in a way that others may find confusing. New solutions are required for access, delivery, management, and protection process of different content types in a transparent way to many different users on multi-platform. In this paper, we design and develop Event Notification System(ENS) to support the transparent and augmented use of multimedia resources across a wide range of networks and devices. ENS can be used for monitoring illegal content access, statistical report such as calculating the royalty for copyright and calculating the advertising rate, and technical report in ubiquitous multiplatform environment.