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TL;DR - OnePlus wanted to release the One in India, Cyanogen backstabbed them by signing an exclusive deal with Micromax, OnePlus got frustrated and decided to make their own ROM, Cyanogen accused them of stealing from Cyanogen and their relationship is now very rocky.
The whole question of theft of intellectual property is a pretty grey area in the digital millennium. Is reverse engineering theft? if it was Dell sure made it past the post on that one. There's lots of mythos around the development of software. Didn't IBM open up their architecture for a reason? wasn't that reason so the technology should develop in a sustainable way? I seem to recall that IBM originally thought the worlds business computing could be reasonably done on two or three mainframes through a distributed network. So when PC bios intelligence features are reverse engineered, it's not theft it's ummmmm creative math. Or perhaps the term New Math is better. More base 2ish. When push comes to shove it's all a numbers game. Bill Gates open letter to hobbyists comes to mind. A trade secret is only valued as a trade secret when steps are taken to protect it. So when Gates fails to secure the punch-tape and loses control of ALTAIR BASIC and I'm assuming MITS MOBILE was engaging the "hobbyists" for an open source intelligence reason, creative math is fair play. Free beer, free software, free love all relics of the sixties. TANSTAAFL Many years ago at a TLUG BOF I facilitated I asked John Hall about emerging open source technology and the people who were most involved in it's development. To paraphrase he said, the PHD's write the software but it is the operators who use and perfect it. So IMHO Gates is a real operator all right and he has a whole class of people following in his footsteps. They want the thing to work just well enough to make money but not so well that it doesn't need constant upgrading and improvement.