Which of those would you like?

Free downloader sites are notorious vectors for malware. Because they operate in a legal gray area, they rarely pay for secure hosting or SSL certificates. When you click "Download," you aren't just getting a PDF.

According to Scribd’s copyright FAQ, “infringement is the copying or re‑use of a copyrighted work without permission of the rights holder”. If you download a document that you have not purchased or that is not explicitly offered for free by its author, you are likely infringing copyright—regardless of whether you use a third‑party downloader or not.