The Kindle does not support PDF at all. You have to convert PDF files to Kindle format (.mobi, .prc, or .azw) before reading. Sometimes the files convert well, sometimes they do not. If they are mostly straight text, it is usually not bad, but can have line breaks in odd places.
There are free software tools available to convert PDF to Kindle format, such as Calibre, Mobipocket Creator (Publisher edition), and the service where you can email the document to Amazon for conversion, either straight to your Kindle, or to your regular email address. If to free.kindlename.com (regular email address), you can move the file to the Kindle via USB.
When you buy a new book, buy it in non-Secure Mobipocket format, or from the Amazon Kindle store.
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