Economic methods are difficult; they aren't selling the app yet. DRM is tricky; you'd have to have a very good implementation to have it check all display programs, as cle re is a display program--it doesn't affect the original file, based on looking at the webpage.
You can, of course, raise a stink. You can ask your publisher to come out against it. Best would be making fun of it and potential derivatives in your books.
The example that blackly amuses me is bowlderizing Game of Thrones. The amount of fuckery and mayhem in that set of works is far, far beyond words. I would not recommend your Laundry series for children, because I don't want to have to deal with their nightmares. And the Laundry novels don't have much swearing in them...
Moral rights of integrity don't work well in a country focused on money (the USA). Internationally you'd get some purchase, if it's not torpedoed by the various secret trade agreements...
]]>