Thanks a lot for the comments. The draft is updated with the
recommendations, and a new revision (-16) is just submitted to the ID
manager.
About Section 11 "Security Considerations", FEC can be applied
either before
or after encryption. Both cases are valid cases, so I kept both of
them. As
discussed in paragraph 2, when FEC is applied after, the FEC data
is secure,
so no additional security measure is needed. When FEC is applied
before, the
FEC data need to be encrypted as well. The rest of the section (from
paragraph 3 and on) focuses on the security considerations for that
scenario.