DRM has been widely used for digital content protection over Internet. Regular DRM systems bundle "user, rights, and content" together during license delivery. Thus, it will be easy to cause the overload of license server when licenses need to be updated frequently. In this work, we present a scheme based on "rights claim", separating the bundled one into "user - rights", "content - rights claim", and "rights - rights claim". We also propose a new DRM system based on our proposal, applying a tag scheme for user grouping and license updating, which especially suitable for large scale live streaming scenario. Comparing with regular DRM systems, it is a simple and secure scheme whose performance and overhead is significantly better.