The more I look at this, the less sense it makes.
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The playkey, unlike the title folder, can't be copied—but it can be moved. To give your friends and family access to the file in question, you can send them a copy but must also provide a link to the playkey. Under the DPP system, though, anyone who can access the playkey can also decide to move it to their own digital vault—in essence, anyone can take the content from you
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The playkey "can't be copied?" Can only one user access it at a time? And how do you arrange a computer file that "can't be copied?"
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this system solves most consumer problems with DRM: no Internet tether on files, no online authentication servers that could go dark, and the unlimited ability to backup files and share them with others. Want to send a song to fifty friends? You can. Want to back it up online, on DVD, on your NAS, and on 3.5" floppy disks? Knock yourself out. Want to resell DPP files by transferring the playkey to a new owner? You can. You just can't share with the entire world—or someone will steal your purchase.
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Can't be copied, can be used by family & friends, but isn't tied to the internet? Can someone who speaks better geek than I explain what kind of file this could possibly be?
The creators of the system posit that releasing a playkey into the wilds of the internet will quickly get it stolen... obviously, they've never heard of bugmenot. I suspect there are indeed jerks who would steal playkeys. I suspect there are also rather large numbers of people who would just exchange playkey location lists.