FYI Samsung was paid by MS to add DRM to the Galaxy devices ~2010. Source: I was part of the team that had to implement the customer-facing part, carrier billing integration and backend 4-way revshare accounting in zero time. Harder than it sounds, and probably never repeated since unless you're preloading it's against terms to introduce payments on Android. IIRC the real heroes were the Indian embedded engineers who were 10x better than the Koreans.