| | Examples | Risk Level | |----------------|--------------|----------------| | Pirate/repository sites (Archive.org, PDF Drive, Scribd user uploads, illegal library sites) | “Free PDF download link” | High (Legal & malware risk) | | Spam or fake download buttons | Ad-filled pages requiring surveys | Very High (Malware, phishing) | | Official previews/samples | Google Books snippet, OUP sample pages (Chapters 1–2 only) | Safe (Legal, but incomplete) | | Third-party summary or answer key excerpts | Quizlet, Studocu (partial content) | Medium (Copyright violation likely) |