Strictly speaking, it's uploading that people get sued for, not downloading.
You can download all that you want from Z-Library or BitTorrent, as long as you don't share back. And indexing copyrighted material for search is safe, or at least ambiguous.
You can download all that you want from Z-Library or BitTorrent, as long as you don't share back. And indexing copyrighted material for search is safe, or at least ambiguous.