what is the control of information from prebook manuscripts to the formation of early publishing houses to the evolution of todays'conglomerates ? who has had and who has not had access to printed information?

Question

Check this site for a brief outline of publishing history.

http://www.infoplease.com/ipea/A0154485.html

Generally, printed information has been available to literate people with the money to buy books. Censorship by governments or churches has limited some access at certain times.