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The PDF viewer is incredibly basic, I don’t know why they needed Adobe Digital Editions SDK. All the PDF viewer does is clip the margins in portrait mode and clip the margins with continuous view in landscape mode (i.e. parts of two pages could be on the screen at once in landscape). This could easily have been done with open source code.
What is strange is no support for device wide PDF search (as there is for MOBI and Amazon ebooks). PDF to text is widely available (open source again), and this is needed for within-document search (which it has for PDFs and all other document types). The problem may be specifying locations accurately, because the DX also lacks note taking within PDFs - perhaps for the same reason. You don't need locations and context for within-document search because you just display the page on the screen (with highlighting).
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