1The company's proprietary software is used by millions of people worldwide, but its source code remains a closely guarded secret.
2Is the new smartphone's proprietary operating system compatible with existing apps and hardware?
3The pharmaceutical company's proprietary research on the new vaccine has been widely praised by the medical community.
4Critics argue that the company's proprietary business model stifles innovation and competition in the industry.
5The company's decision to open-source its proprietary technology has been seen as a major shift in its business strategy.