The 'Open Web' means "My browser can access ANY AND ALL CONTENT on the Web given that it supports the necessary standards."
This DRM implementation would add this suffix: "and any number of third parties have chosen to allow my browser to use their proprietary decryption modules." This is the opposite of the Open Web and therefore a threat to user freedom and the integrity of the Web as a whole.
This DRM implementation would add this suffix: "and any number of third parties have chosen to allow my browser to use their proprietary decryption modules." This is the opposite of the Open Web and therefore a threat to user freedom and the integrity of the Web as a whole.