| | Likely Content | Risk Level | |------------|--------------------|----------------| | LibGen / Z-Library | Exact 1987 scan, no changes | Low (copyright infringing) | | Random tech forum | 1987 scan + malware .exe inside | High | | eBay / used book sites | Original print book | Safe (legal) | | "Private" Telegram channel | Possibly a fake or corrupted file | Extreme |