jack uses analog input, standard headphones are "dumb" device that reproduces any signal it receives. with digital interfaces on the other hand the devices are

jack uses analog input, standard headphones are "dumb" device that reproduces any signal it receives. with digital interfaces on the other hand the devices are no longer "dumb" and extra "features" can be implemented, like HDCP: https://en.wikipedia.org/wiki/High-bandwidth_Digital_Content_Protection https://en.wikipedia.org/wiki/High-bandwidth_Digital_Content...