| http://www.w3.org/ns/prov#value | - There is thus no requirement that any set of trusted root keys be maintained; [0028] (d) The mediator M, a semi-trusted third party who mediates the transaction between the owner and the consumer and who can arbitrate in the event that the parties do not follow the protocol. [0029] As can be seen from the above, there is a distinction between the two roles of the consumer and the printer.
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