Final answer:
The principle that restricts information sharing to individuals directly involved in a project or organization is the Need-to-know principle, which preserves confidentiality and proper use of data in research settings.
Step-by-step explanation:
The principle that information is not to be given to anyone not involved in the project, testing site, or organization is best represented by the Need-to-know principle. This principle is essential in maintaining confidentiality in research and organizational settings.
For instance, researchers must gain consent and be transparent with informants about the use of data. Moreover, protocols may require that data be archived or destroyed post-project to prevent misuse.
Collaborators in a project can remain anonymous unless they consent to disclosure, and they may have rights to review and edit research findings, ensuring accurate representation in future publications.