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If you wanted to implement note-taking the same way that PocketBook does, then it probably wouldn't be too bad. They have functions for that within their SDK. The drawback is that those notes aren't really that portable to other devices or applications.
Being able to embed the annotations into the original document would be great, but that would be a gargantuan task. Each different kind of document would do annotation in its own way, if at all.
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