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Hello Karen,
If you purchase from the Sony Store, the ebooks will be in LRX format. This is Sony's proprietary format and can only be used via Sony's device.
Most ebook sites will have encrypted PDF. These can be read natively on the Sony but PDF is not the ideal format of choice for ebooks. Also if you live in the US and borrow ebooks from the library, most books will be in PDF format. To download and install DRM PDF ebooks to your Sony you will need Adobe Digital Editions (ADE).
Other stores will give you the option of DRM and DRM-free EPUB and DRM-free LRF. These are also readable on the Sony. DRM EPUB will need ADE above to load to your Sony whereas the DRM-free formats can use the Sony software or Calibre to load books to your device.
There are other formats available for they will usually require removing DRM and then converting them to a format readable on the Sony.
Hope this helps and congradulations on your purchase.
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