Proprietary
Part of speech: adjective
Definition: Of or relating to property or ownership, as proprietary rights. Of or relating to the quality of being an owner, as the proprietary class. Manufactured exclusively by the owner of intellectual property rights (IPR), as with a patent or trade secret. Privately owned, as a proprietary lake. Possessive, jealous, or territorial.
Confidential
Part of speech: adjective
Definition: (meant to be) kept secret within a certain circle of persons; not intended to be known publicly