[1] IETF Trust Workspace <http://trustee.ietf.org/>

[2] Trust Legal Provisions (TLP)Documents ( (2011-02-01 04:09:09 +09:00 版)) <http://trustee.ietf.org/license-info/>

[3] IETF Trust (2010-03-25 07:54:59 +09:00 版) <http://trustee.ietf.org/>