I wanna make an android app based on Chanakya Niti, for that I definitely need a source and i have a book for that but the confusion is it says you can't copy the content in any form. How can any publisher claim copyright on the teachings of person used to live in India centuries ago. The confusion is many people are saying it's in public domain, you can make an app but the source like books saying you can't copy the content.
The second confusion is few people have said that you can't make money outta it but the developers are already making money by monetizing their app. I wanna make more money by putting it in "in app-purchases" category, so why I can't do that?
Any suggestion is appreciated.