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The phrase "are proprietary" is correct and usable in written English.
It can be used to describe something that is owned by a specific individual or organization and is not available for public use or distribution.
Example: "The software features are proprietary, meaning they cannot be shared or modified without permission from the company."
Alternatives: "are owned" or "are exclusive."
Dictionary
are proprietary
noun
A proprietor or owner.
synonyms
Exact(57)
Many such recipes are proprietary.
"Companies that are proprietary can charge what they want to for their software.
Rental renewal rates are proprietary to landlords and nearly impossible to track.
What has really hobbled progress is that the systems are proprietary and incompatible with competing products.
Two are proprietary products (owned by Chiron and GlaxoSmithKline) and so less attractive.
But there are exceptions, as sometimes the data are proprietary or very sensitive.
Although the standards for accessing the services are open, their inner workings are proprietary.
Details of the plan are not available, however, because backers say they are "proprietary".
Pharmacy benefit managers have generally refused to disclose details of the rebates they receive, which they say are proprietary information.
The switching center may look for all sorts of factors, most of which are proprietary to the company's software.
The industry argues that the chemicals are proprietary secrets and that disclosing them would hurt their competitiveness.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com