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| # | Requirement | Priority | Acceptance Criteria | |---|-------------|----------|---------------------| | FR‑1 | – Accept YouTube, Vimeo, Dailymotion, Facebook, Instagram, TikTok, and user‑uploaded MP4 links. | Must | - Invalid URLs show a clear error. - Supported URLs show a “✓” and a preview thumbnail. | | FR‑2 | Resolution/Format Picker – Populate list based on source capabilities (e.g., 144p‑8K, MP4/WEBM, audio‑only MP3/AAC). | Must | - List updates in < 500 ms after URL validation. - Pre‑select “best‑compatible” (720p MP4) for free users. | | FR‑3 | One‑Click Download – Trigger server‑side fetch, transcoding (if needed), and delivery via secure temporary link (expires in 10 min). | Must | - Download begins within 2 s of click. - Link is HTTPS and uses a signed token. | | FR‑4 | Batch Processor – Accept up to 100 URLs per request (CSV/JSON). Process in parallel with max 4 concurrent jobs per user (adjustable for premium). | Should | - Returns a zip file with all requested videos. - Provides per‑item status (success/failure) in a JSON manifest. | | FR‑5 | Subtitle Integration – Detect embedded or external subtitles (SRT, VTT) and optionally mux them into the output file. | Should | - A toggle “Include subtitles” appears when subtitles exist. - Output file contains subtitles track. | | FR‑6 | API Endpoint – POST /api/v1/download with JSON payload url, format, subtitles, api_key . Returns signed URL or job ID. | Must | - Rate‑limited (free: 20 req/min; premium: 200 req/min). - Proper error codes (400, 401, 429, 500). | | FR‑7 | CLI Wrapper – sxey-dl (Node/Python) that reads a file of URLs, calls the API, and saves files locally. | Should | - Works on Windows/macOS/Linux. - Shows progress bars per video. | | FR‑8 | Legal‑Use Guard – Run a quick “copyright‑risk” check (e.g., based on video metadata, content‑ID flags) and display a modal requiring user acknowledgment before proceeding. | Must | - Modal appears for “high‑risk” videos. - User can abort or proceed with explicit “I have the right”. | | FR‑9 | User Account System – Email‑based sign‑up, OAuth (Google, Apple), 2FA optional. Store API keys, download history, and tier status. | Must | - Users can view/download history (last 30 days). | | FR‑10 | Payment Integration – Stripe (or local alternatives) for subscription plans (Free, Pro $9.99/mo, Enterprise $49.99/mo). | Must | - Successful payment upgrades tier instantly. - Billing portal for cancellations. | | FR‑11 | Analytics Dashboard – Real‑time metrics: active users, downloads per hour, average latency, error rate. | Should | - Admin UI shows graphs; data exported as CSV. | | FR‑12 | Security – All traffic HTTPS, CSRF protection, rate limiting, IP‑based abuse detection, GDPR‑compliant data storage. | Must | - Pen‑test passes OWASP Top‑10. - No plain‑text passwords stored. | | FR‑13 | Performance Optimisation – Use edge CDN for static assets, keep‑alive connections, chunked streaming for large files (> 1 GB). | Should | - 95 % of downloads < 5 s for ≤ 720p on a 20 Mbps connection. | | FR‑14 | Responsive UI – Mobile‑first layout, progressive‑enhancement, accessible (WCAG 2.1 AA). | Must | - All core functions usable via keyboard/touch. - Color contrast ≥ 4.5:1. | | FR‑15 | Dark Mode – Automatic based on system preference, toggleable. | Nice‑to‑have | - All UI elements adapt without flicker. |
appears to be a typical example of a "malformed URL" or a "keyword-stuffed" phrase often associated with high-risk areas of the internet [1, 2]. While it looks like a simple search for media content, it serves as a perfect case study for understanding the intersection of digital literacy, cybersecurity, and the mechanics of the modern web. The Anatomy of High-Risk Domains www sxey video download better com
To ensure a safe and successful video downloading experience, follow these steps: | # | Requirement | Priority | Acceptance
Open the app and use the built-in search bar or paste a copied video link. | | FR‑2 | Resolution/Format Picker – Populate
: A widely used browser tool that identifies video files on active pages, allowing you to select and save specific sizes or resolutions directly to your computer. Safety Checklist for Downloading Media