Hello,
I've got bugs #901504 and #901505 stating that Fedora should not distribute MIB files generated from IETF RFCs.
Some RFC, e.g. 4293 [1], contains MIB files as part of the RFC text. 1: https://tools.ietf.org/html/rfc4293
Net-SNMP and libsmi upstream tarball already contains these MIB files extracted from the RFCs. The 'extraction' is just copy of part of the RFC with removed page headers / footers.
Now, can Fedora ship these files? IMHO yes, reading RFC 5377, chap. 4.3, it's IETF's intention to allow such extraction, modification and distribution. But I am not a lawyer.
The MIB files are considered Code Components as defined at http://trustee.ietf.org/license-info/ and its license is (probably) defined at http://trustee.ietf.org/docs/IETF-Trust-License-Policy.pdf
Removing the MIB files from the packages would be very tedious, annoying and IMHO useless.
Jan