I think that the copyrigt statement (not the "all rights reserved"
line Donald points out though) needs to be in all IDs
my logic follows the requirement that the author give the IETF the
right to publish as an ID and thus must transfer the non exclusive limited
right to publish the ID - the IETF has a copyright (limited use etc) on
the actual ID as published even though the author retains all
other copyright rights - this also makes it clear that the ID
can not just be grabbed by someone (outside the IETF) for their
own (unatributed) use