[publicmail]

I don’t really think it’s DRM. I think it’s because a lot of garage door buttons have a few functionalities, like controlling the lights as well as the door, but it works over two wires. So it probably necessitates some more complicated logic.

[CamperBob2]

This one didn't. It was literally just a featureless button, engineered with intelligence it couldn't possibly need except as a means of locking out third-party hardware.

[ssl-3]

Even the "dumb" buttons are on a common serial bus with Security+.

I agree that it is annoying in a "It's just a momentary switch! How hard can it be!" sort of way, but it be that way anyhow.

[ArchOversight]

It's Security+ or Security+ 2.0, it is literally obfuscated serial traffic over two wires. It is DRM. You can't just get any random button to open/close the garage.

[josephcsible]

No, it's DRM. On older models, control over auxiliary functions worked by the buttons connecting capacitors of different capacitances across the two wires (the door control itself was still a direct short). This works fine; DRM is indeed the only reason newer models changed it.