A system and method are provided for the distribution of digital licenses through a multi-level distribution chain using one or more clearinghouses. The system supports content providers, distributors, and end users. Content providers create and provide licenses. Distributors acquire licenses from content...http://www.google.com.tw/patents/US20040039916?utm_source=gb-gplus-share專利 US20040039916 - System and method for multi-tiered license management and distribution using networked clearinghouses
