What usage is OK without a license?
The acronym “IETF” may be used factually in any on-line or traditional publication, in presentations and documents, and in press and media reports, as a descriptive term for the Internet Engineering Task Force. The same applies to other phrases such as “IETF Secretariat”, “IETF Trust”, “IETF Standard” or “IETF RFC”. The IETF logo may be used, without modification, to accompany descriptive text to refer specifically to the IETF organization itself or its work. The logo must be reproduced in the exact format, scale and colors displayed at http://www.ietf.org/images/logos/. Neither the IETF name nor logo alone or in combination with other words may be used to claim support or endorsement for, or as an indication of origin of, any goods or services.
