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Some PDFs are made of page scans without OCR (conversion to text) and cannot have fonts enlarged because they don't actually have any fonts, each page is simply a picture.
LRF is the original format used by Sony, now superseded by the open format ePub.
Converting to ePub/lrf can take a very long time depending on the complexity and internal layout of the PDF... I've had PDFs take over 20mins not to mention some failing completely due to internal problems...
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