Quote:
how do I know a file is DRMed before I buy it
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I did understand you, that is why I linked to the BoB page that explains that your Sony is not compatible, which you really should have checked before buying. Another page which is device-centric:
https://www.booksonboard.com/index.p...election_Chart
At the end of the day, if you BUY an ebook anywhere, there is a 95% chance it will have some form of DRM on it.