There are many different ways that you can use public domain works to profit. How you choose to use public domain works will be in direct proportion with exactly what you are trying to accomplish. For instance, if you dont have a product, you may use these works to create a product. If you do have a product, you may use public domain works to sell that product, or to make that product more valuable. You can even profit from public domain works without having or creating a product at all.
The first way to profit is to find a public domain work that relates to your market, and rewrite that work to bring it up-to-date. You can also use various parts of different works to create the product. You can alternately sell a public domain work as it already is, as long as the information still applies to todays world.
Many people use public domain works to create a collection of some type. You can create collections of articles, collections of art or photographs, or collections of music. The possibilities are endless, and when you use public domain works to create a collection, you can put your name on the collection as the author, even though you arent the author of the...