Editing (Symmetric) Private Information Retrieval (section)

===Classical database===
*Location-based services (to protect user location privacy).
*Queries of electronic medical records (these require decades of information confidentiality; hence security against quantum computing based attacks is necessary) or medical test reports.
*Music and film streaming (user does not want his/her tastes to be revealed to the server).
*Pay-per-view services, where the user should pay a fee to access every single database element.

Quantum (S)PIR protocols may be preferred to their classical counterparts to:
*Achieve (S)PIR with better communication complexity: this is convenient in the case of large databases.
*Achieve (S)PIR with better security: for instance, to secure classical channels as in [[#References|[5]]].