If you extract, say, a C header file, or an ASN.1 schema, from an RFC
into an application, I believe that may be regard as a "derivative
work".
see RFC 3667 Section 3.3 (a) (E)
(E) to extract, copy, publish, display, distribute, modify and
incorporate into other works, for any purpose (and not
limited to use within the IETF Standards Process) any
executable code or code fragments that are included in any
IETF Document (such as MIB and PIB modules), subject to the
requirements of Section 5 (it also being understood that the
licenses granted under this paragraph (E) shall not be deemed
to grant any right under any patent, patent application or
other similar intellectual property right disclosed by the
Contributor under [IETF IPR]).
Scott
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