I'm assuming you're referring to private information retrieval (https://en.wikipedia.org/wiki/Private_information_retrieval https://en.wikipedia.org/wiki/Privat

I'm assuming you're referring to private information retrieval (https://en.wikipedia.org/wiki/Private_information_retrieval https://en.wikipedia.org/wiki/Private_information_retrieval), which is from the same field of research, but may or may not use the same techniques.