| Method | Description | Prevalence | |--------|-------------|-------------| | | Scripts that capture video streams (e.g., IDM, Udemy-dl, youtube-dl forks) | High | | Torrent / piracy sites | Pre-downloaded course packs shared via The Pirate Bay, Docero, or Telegram channels | Very High | | Shared accounts | Credentials for paid Udemy accounts shared publicly | Medium | | Cracked DRM removers | Tools that decrypt Udemy’s video files | Low (and often fraudulent) |