All Non-Apple Lighting Cables require a official chip from Apple. So Tim Cook might say that DRM is wild speculation it is actually happening now with all their cables.

So in order to buy a adapter I MUST buy a cable with a chip from Apple that makes it authorized.

EDIT : I guess EFF are wild speculators?

"To its credit, Apple has been adamant it won’t use the new design to restrict your listening experience. But therein lies the problem: you shouldn’t have to depend on a manufacturer’s permission to use its hardware however you like (or, for that matter, to build your own peripherals and accessories for it)."

Currently "it’s impossible to connect a speaker or other audio device to an iPhone without Apple software governing it"

https://www.eff.org/deeplinks/2016/09/analog-last-defense-ag...