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By contrast, ReDigi said, its advanced technology uses a "transfer only mechanism" that first verifies the digital object is "legally eligible for resale," and then "only the 'original' good is instantaneously/atomically transferred from seller to buyer without any copies."
While ReDigi does not clarify how its "transfer" is not a "copy" but Amazon's transfer is, it adds that, unlike Amazon's model, there is "participation of all parties from consumer to artist/author to copyright holder" in the profit chain.
Melissa Webster, program director for content technologies at IDC, called the idea of a user digital content marketplace "a very intriguing concept." She noted, however, that the intellectual property laws for digital content provide "no clear picture" of what might be acceptable, plus different categories of content have different and often complex terms and conditions attached to their sale.
Webster said that, as an experiment about a year ago, she tried to sell on eBay a used software application, and was confronted with a variety of conditions, rights limitations and forms to navigate. But, she noted, if the software vendors and other rights holders got a piece of the resale, perhaps the rights structures will be simplified to accommodate such a market.