Doesn’t that run into copyright laws? There aren’t any Richard Marcinko audiobooks, and that’s probably by his decision.
To be honest, sounds to me like a great way to have multiple lawsuits thrown at you.
Books copyrighted prior to 1923 are now in the public domain. A lot of other items are as well. Here is a general chart:
http://copyright.cornell.edu/resources/publicdomain.cfm
In additon, many recent items are licensed by the authors under Creative Commons or similar permissions. See creativecommons.org