| Source | Format | DRM? | Notes | |--------|--------|------|-------| | | AZW3 (convertible to EPUB via Calibre) | Yes | Purchase then strip DRM for personal backup (legal in some jurisdictions). | | Google Play Books | EPUB | Yes | Can download as EPUB (Adobe DRM). | | Kobo Store | EPUB (Kepub) | Yes | Native EPUB support. | | Apple Books | EPUB | Yes | Best for Apple ecosystem. | | eBooks.com | EPUB | Yes | DRM-free rarely, but reputable. | | Public Library (OverDrive/Libby) | EPUB | Yes (temporary) | Free with library card – fully legal. | | Project Gutenberg | N/A | No | Digital Fortress not available (copyrighted). |