"restricted information" is correct and usable in written English. It is often used in situations where sensitive information with limited access is being discussed. For example: "This document contains restricted information; you must not share it with anyone else.".
"Manning had privileged access to restricted information.
She noted that none of the images were considered restricted information or classified.
Wikipedians, as they call themselves, have removed or restricted information in the past.
Organisations can be surprisingly lax about letting temporary workers see supposedly restricted information.
But they must have access to restricted information, they insisted, if they are to do their jobs right.
The dead man's uncle said the family were unhappy with the restricted information released.
Dr. Lee was indicted nine months later on charges that he had transferred huge amounts of restricted information to an easily accessible computer.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK