| http://www.w3.org/ns/prov#value | - However, theft of services is a problem when such a scheme is used because unfettered access to the metered account is available to anyone who obtains knowledge of the PIN number for the pre-activated metered account, necessitating the storage of such cards under lock and key by the retail merchant until the moment the cards are sold, thereby preventing the stocking of such cards on store shelves
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