Oops, and now I dropped the `if t['resolution'] == 'Signed':` test by mistake..

{{{
from trac.core import *
from trac.perm import IPermissionPolicy
from trac.ticket.model import Ticket

class ReadonlySignedTickets(Component):
     implements(IPermissionPolicy)

     def check_permission(self, action, username, resource, perm):
         if resource is None or resource.realm != 'ticket' or \
            resource.id is None or action == 'TICKET_VIEW' or \
            action == 'TRAC_ADMIN' or 'TRAC_ADMIN' in perm:
             return None

         t = Ticket(self.env, resource.id)
         if t['resolution'] == 'Signed':
            return False
}}}

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