Software　license　is　the　most　well-used　technology　in　copyright　protection　of　commercial　software　and　shareware,　as　well　as　the　development　and　management　of　free　software　and　open　source　software.　There　are　several　different　license　types　that　allow　controlled　access　of　services.　The　two　most　popular　types　are　the　fixed　license,　which　gives　access　rights　for　an　identified　workstation,　and　the　floating　license,　which　restricts　the　number　of　simultaneous　users　to　a　certain　bound.　In　this　paper,　we　propose　a　floating　license　system,　called　MFFLS,　which　efficiently　implements　the　management　and　protection　of　software.　©2009　IEEE.