Regarding publishing via web services, Eric A. Hall says
[if a domain doesn't install new software,] they wouldn't be enforcing
a
reciever-side enforcement system either. If they don't think that
forgery
is enough of a problem for them to bother enforcing, then they've
abstained.
You're confusing the *publish* decision with the *check* decision --
it's perfectly reasonable to make them separately. We want to make it
dirt easy for a domain to publish, because that increases the value of
every one else's checking. It would be a grave mistake to tell people
they can't publish without running a web server and installing new web
service software.
-- Jim Lyon