Not all of it. Their FAQ say: > Why not make any and all public domain content freely available? We do not believe that just because something is in the public

Not all of it. Their FAQ say: > Why not make any and all public domain content freely available? We do not believe that just because something is in the public domain, it can always be provided for free. There are costs associated with selection, digitization, access provision, preservation, and a wide variety of services that are necessary for content to reach those who need it. We have determined that we can sustain free access and meet our preservation obligations for this particular set of content for individuals as part of our overall activities undertaken in pursuit of our mission.