| http://www.w3.org/ns/prov#value | - A major problem with this type of DRM is that end users often wish to share coupons (which may be represented by barcodes or applications that display barcodes) with other end users, but coupon issuers do not wish to allow person to person sharing unless they obtain information about the individual to whom the code is being transferred, such as a phone number or other opt-in information.
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