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Even encryption that relies on something like the SSN doesn't work if the software to read it isn't supported on a platform you want to use, or loses support over time. eReader is a good example-- won't run on the iLiad or the eBookwise, the two systems I use.
People who don't re-read books tend not to see a problem with any of these schemes. Those of us who re-read extensively don't want any DRM whatsoever, and will continue to use utilities to remove it as soon as we encounter it.
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