Actually, HDMi is encrypted and only peripherals approved as receivers (i.e. not re-encoders) have the decryption key. So they’ve tried at having a closed gard

Actually, HDMi is encrypted and only peripherals approved as receivers (i.e. not re-encoders) have the decryption key. So they’ve tried at having a closed garden. They didn’t succeed much because they had to enable HDMi-to-VGA adapters, and VGA is not encrypted. But the resolution is lower. But the battleground has been tested for complete lockdown of image output, and now that they have the rough idea, no doubt the next standards are going to be more and more restrictive.