Firmware, operating systems and ____ software are ____ types of software. Software can be off the shelf or ____. It can also be ____ or open source. All software development takes time and expertise, but there are many models for ____ software development, and different models of ownership. Proprietary software (sometimes referred to as ____ source software) is software that legally remains the property of the organisation, group, or individual who created it. The organisation that owns the rights to the product usually does not release the ____ code, and may insist that only those who have purchased a special ____ key can use it. Free software (also called ____) is licensed at no cost, or for an optional fee. It is usually closed source. ____ source software is free and openly available to everyone. People who ____ open source products publish the code and allow others to use and ____ it. ____ of programmers often work together to ____ the software and to support users. Open ____ products are usually tested in public by online contributors. Large companies such as ____, Facebook and the BBC make use of open source technology. For example, the ____ makes use of MySQL and it creates open source software, such as the program to improve the compatibility of ____ on smart TVs.

Proprietary, free and open source software

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