This is the grey area. likely operates in a legal gray zone. While it may host public domain works (pre-1928 in the US), it almost certainly hosts copyrighted material.
: For those preparing for competitive exams like the BCS (Bangladesh Civil Service) or banking sectors, the site offers curated guides and previous years' question papers. purepdfbook.com
: Before committing storage space to a large structural engineering or civil service guide, read the text version on responsive browser portals. This is the grey area