But if you have hundreds of ebooks say, then you have to go back to every site you purchased these books and change the PID and then redownload. Thats not a prospect that will be much fun at all.
Even time-limited DRM is a pain. If you are reading a book and not finished with it, you have to go back to the site and if it is available, you have to check it out again, redownload it, delete all the other copies that have expired, install it on your portable reading device (Unless it's just the computer) and continue from where you left off. That is annoying. If I had a pbook, I'd just go to the library website, renew it and all is well.
But, as far as DRM goes overall, time limited DRM for libraries only is not too bad.
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