Facet granting through authorization certificates

>
>  H'lo everyone.
>
>  A delightfull idea occured to me but a little background info first.
>
>  An authorization certificate is basicly a digitaly signed message where the
> signer gives third party a permission to use a certain service(s)/resource(s)
> given, of course, that the signer emself has those or superset of those
> permissions.
>
>  So, why not write a Croquet TMessageRouter subclass that can grant a
> TMessageRouterClient a facet based upon a (series) of authorization
> certificates?
>
>  (see http://theworld.com/~cme/html/spki.html and
> http://en.wikipedia.org/wiki/Authorization_certificate for more info)
>
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>