Well... there's no technical difference. My understanding from the Apple/FBI fiasco is that it's an open question whether the US government is legally able to

Well... there's no technical difference. My understanding from the Apple/FBI fiasco is that it's an open question whether the US government is legally able to compel you to write and deliver custom code to your clients. But any local judge can issue you a warrant to hand over encrypted customer data that you're holding the key to. But IANAL, maybe my take on that is overly simplistic.