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"Non-proprietary" is the opposite of the above. These are more commonly referred to as "free" operating systems, since you have access to the underlying code, and can modify it. Linux and FreeBSD are excellent examples of non-proprietary operating systems. The choice of non-proprietary operating systems can make it much easier to upgrade hardware as new technology becomes available.
Most common operating systems are proprietary. This means that only a limited number of applications can operate on them. This has a tendency to limit productivity.
In a proprietary operating system, there are fewer people available to audit the code for any bugs and security flaws. A proprietary system also limits the end-user in the types of modifications they can make to the system.
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Free operating systems based on Linux (e.g. Ubuntu) Unix based operating systems (e.g. Apple's) Proprietary operating systems that are locked into one manufacturer and therefore expensive (e.g. MS Windows).