A nice platform for selling PDF books like Google Play. Any suggestions?

I’m an author who are currently selling books on Google Play. The service works really good and has a wide support for mobile devices etc. The huge downside is its limitations when it comes to territory. It’s only available in like 30 countries.

I have people in Israel, Nepal and other countries where Google Play don’t reside and probably won’t be for a while. So I’m looking for an alternative platform that does not have this limitation. However, I still have some requirements:

• Prohibit download of the PDF – This is to protect it from being spread outside of the platform. It has happen before when I even had DRM support turned off on Amazon. Writing 700 pages trying to make a living out of it kinda sucks when someone simply spreads it for free.

• HTML5 or Mobile App support – Since most of the readers will be using iPads and what not.

• The book needs to be sold on that platform or a third party

• Need to use PDF.

Is there any good platform for this except Google Books? I have searched like hell but all I have found is sites that provides the user with a download link.

Thanks in advance!