| http://www.w3.org/ns/prov#value | - The postage accounting system according to claim 4, wherein the variable information includes a value of postage, the microprocessor programmed for transmitting a permission-to-print message to the printing module, and the microprocessor including means programmed for debiting a credit value by an amount corresponding to the postage value prior to transmitting the permission-to-print message.
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