Confidential computing
IBM has been working on confidential computing for roughly a decade. The concept behind the technology is to permit clients to retain full privacy and control over data and operational workloads through hardware-level security.
This can include the implementation of "secure enclaves" -- trusted execution environments -- which can manage data and are only accessible through authorized programming code, keeping information away not only from cloud or infrastructure providers but also external threat actors.
IBM likens the technology to a hotel room safe, in which keycards are required to access the room, but further authorization is required to open the lock to the safe.