I intend to make and sell e-books across the mobile devices. And of recent I came across Open Heavens 2014 in Google Play and I downloaded it on my handset and after the installation it asked for "Please enter your PIN to activate the app. You can visit the website to purchase an activation code".
I see this as a very good way of controlling the piracy, coping and duplicating the e-book. Is there any of my seniors in this forum that knows how to go about this type of e-book protection? Generating the pin code to protect the application?