And regarding DRM: I see DRM as a UI technique, not security. You can create products whose UI is intentionally crippled in such a way that it becomes very hard

And regarding DRM: I see DRM as a UI technique, not security. You can create products whose UI is intentionally crippled in such a way that it becomes very hard to make copies of content. But at the end of the day, none of these systems are truly "secure", just inconvenient. You can do the same with capability-based systems, if you really want to.