In camera and Sub-rosa

In camera adverb - In a manner intended to prevent knowledge or awareness by others.

Sub-rosa and in camera are semantically related. In some cases you can replace phrase "Sub-rosa" with "In camera", this phrases are similar.

Sub-rosa adjective - Designed and carried out secretly or confidentially.

In camera and sub-rosa are semantically related. Sometimes you can use "In camera" instead an adverb phrase "Sub-rosa".