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I tried multiple PDF readers, and then I found Okular

It's especially useful if you need to convert somewhat niche formats, like DjVu or DVI files. Okular can even read certain ...

Amazon overhauls DRM rules for Kindle Direct Publishing: Here’s what’s changing

Starting January 2026, Amazon will let DRM-free KDP titles be downloaded as EPUB and PDF files, though authors must opt in for older books and concerns over piracy may push some toward enabling DRM.