Definition of Open Source

If a program is open-source, its source code is freely available to its users. Its users – and anyone else – have the ability to take this source code, modify it, and distribute their own versions of the program. The users also have the ability to distribute as many copies of the original program as they want. Anyone can use the program for any purpose; there are no licensing fees or other restrictions on the software.

For example, Ubuntu Linux is an open-source operating system. You can download Ubuntu, create as many copies as you want, and give them to your friends. You can install Ubuntu on an unlimited amount of your computers. You can create remixes of the Ubuntu installation disc and distribute them. If you were particularly motivated, you could download the source code for a program in Ubuntu and modify it, creating your own customized version of that program – or of Ubuntu itself. Open-source licenses all allow you to do this, while closed-source licenses place restrictions on you.

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