To　effectively　implement　fair　use　and　rights　transfer　of　digital　content　in　DRM(digital　rights　management)　system,　a　usage　control　protocol　model　MUCON(Multi-UCON)　using　encryption,　digital　watermarking　technology　and　traitor　tracing　technology　based　on　UCON(usage　control)　is　proposed,　whose　characteristics　are　feature　binding,　flexible　authorization,　traitor　tracking,　and　off-line　control.　Meanwhile,　the　security　of　the　protocol　was　proved,　and　the　performance　of　this　protocol　was　simulated　by　VC++6.0.　The　analysis　and　the　experiment　results　show　that　this　protocol　model　is　secure,　easy　implemented,　and　is　a　good　solution　to　the　DRM　system.　©　2010　IEEE.