[thrilleratplay]

While I agree that companies should share development libraries/SDKs, this will not prevent reverse engineering and if closed source gives reverse engineers another avenue to gain access. BMW likely declined due to possible liability. If someone creates a smartphone app than anyone could download that unlocks the vehicles and is sued, it is easier to convince lawyers, judges and nontechnical plaintiffs that the company is not at fault if they provided no access to the software regardless of whether the SDK provided was utilized or not. Even if there was an explicit opt in for each vehicle to allow users to utilize a SDK, the auto industry does not have protocols on how to do factory resets after the vehicle changes hands.