Much of the information available today is copyrighted by the owner, which makes it illegal for anyone to sell it without the permission of the copyright owner. This applies to books, artwork, music, videos, etc. But there is a class of information content called “public domain.” It is owned, not by an individual or a corporation, but by “the public”. That is, anyone can use this content without asking permission from anyone. You can legally use it yourself (e.g., on a website) or sell (and profit from selling) any of this public domain content. There are a number of ways... [...]