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| Feature | Description | Implementation Hint | |---------|-------------|---------------------| | | Show download progress for large PDFs (≥ 30 MB). | Use XMLHttpRequest with responseType: 'blob' and monitor onprogress . | | “Add to library” | Store a reference in the user’s account so they can re‑download later without hitting the purchase check again. | Create a UserLibrary table; after a successful download, insert a record. | | Email receipt with download link | Useful for after‑sale confirmation. | After purchase, send a templated email containing a single‑use signed URL (expire after 24 h). | | Analytics dashboard | Plot daily/weekly downloads, conversion rates, geo‑distribution. | Store each log entry in a dedicated download_events table and use a BI tool (Metabase, Superset). | | Multiple formats (PDF, ePub, MOBI) | Offer alternatives for e‑readers. | Keep separate files, expose a selector UI, and pass a format query param to the API. | | Digital Rights Management (DRM) | For highly sensitive content. | Consider lightweight watermarking (user name + timestamp) on

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