iCloud Private Relay Overview 
 iCloud Private Relay Overview Learn how Private Relay protects 
 users’ privacy on the internet. December 2021 
 Introductio...

https://www.apple.com/jp/privacy/docs/iCloud_Private_Relay_Overview_Dec2021.PDF

, helping to assure the privacy of the shared information. In order to stay within the privacy budget we do not send the entire sketch matrix to the server ...

https://www.apple.com/jp/privacy/docs/Differential_Privacy_Overview.pdf