I want to market a hardwired audio book (mini-tablet/poor man's Kindle) with downloadable content. I am trying to decide whether to use Android or Firefox for the OS. So before in invest a lot of time in software development I want to make sure if I choose Android for the OS that I will be able to write code to go onto my website and buy (and download) content without paying Google 30%. So really what I am asking is this blocked in Android or does it violate their terms and conditions ?