A more thorough explanation:

A proprietary right is a legal term that refers to the interest, claim, or ownership that one has in tangible or intangible property. It is a legally enforceable claim that another will do or will not do a given act. For example, a person who owns a house has a proprietary right to that property, which means they have the legal right to sell, rent, or use it as they see fit.

Another example of a proprietary right is publishing rights. If an author writes a book, they have a proprietary right to the book, which means they have the legal right to publish, distribute, and sell it. No one else can do so without their permission.

Proprietary rights are important because they protect a person's ownership and control over their property. Without these rights, anyone could use or take someone else's property without consequence.