implementer
Click on the red underlined text to get to the source
... IETF Contributions are requested to
state specifically what conditions apply to implementers of the
technology relative to the use of such trademarks. Such statements
...
... attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
...