Generate the Zone Signing Keys (ZSK) for the zone. Sign the ZSK using the KSK. Sign the relevant Resource Records of the zone using the ZSK. Update the ZSK ...

https://www.apple.com/jp/legal/intellectual-property/tld/dps/

a simplified version of the system configuration to trackers so more devices look identical, making it harder to single one out. And unlike some other brows...

https://www.apple.com/jp/safari/docs/Safari_White_Paper_Nov_2019.pdf