Sony PRS-650RC - Manual (Page 23)

Step 4: Transferring your eBooks to your Reader
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Authorize your Reader.
If this is the first time that you have transferred a
purchased eBook to your Reader, Reader Library
will prompt you to authorise your Reader.
Click [Yes] to continue.
Once authorised, the transfer will proceed.
If the Reader Library does not function as expected,
refer to “Troubleshooting” in the Reader Library
[Help] menu.