Licenses
When talking about open source, the word free is often used. People new to the subject often take it to mean nothing to pay, and open source software licenses do indeed guarantee that you can use the software to develop and deploy systems for no charge. However, the more important meaning here is freedom, since you are free to obtain the source code, modify it in any way you see fit, and redeploy it in other systems. These licenses give you this right. Compare that with shareware licenses which allow you to copy the binaries for no cost but do not give you the source code, or other licenses that allow you to use the software for free under certain circumstances, for example, for personal use but not commercial. These are not open ...
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