管理重复内容下载的方法

Original abstractA method for managing downloads of contents. This method provides for a replay memory that stores a globally unique right object identifier (GUID) and a right issuer timestamp (RITS). A duplication memory is used to store a right object (RO) in downloading a duplicate of content that is already stored in the replay memory. When a right issuer timestamp (RITS) included in the right object (RO) of the currently received content is less than the current time plus the set threshold value, and the globally unique right object identifier (GUID) and the right issuer timestamp (RITS) of the received right object (RO) are already stored in the replay memory, the received right object (RO) is separately stored in the duplication memory in association with the globally unique right object identifier (GUID).