Shopp is licensed software, meaning there are some things you can and can’t do with the software and the source code. Shopp is distributed under an open source license called the “GNU General Public License”, specifically GPL v3. The license is distributed with every copy of Shopp and is reprinted here for your convenience. It is a very well established open-source license, and if you’ve ever used open-source software before, it’s likely used the GPL.

Free-Speech Software

Open-source licenses, such as the GPL, typically define the freedoms you have with the software. Understand, we’re talking free (as in free-speech) not like a free product (like free beer). Specifically, free software is about four freedoms of software use:

  1. The freedom to run the program, for any purpose
  2. The freedom to access and study the source code
  3. The freedom to make copies (so you can help others)
  4. The freedom to improve the program and release the improvements to the public

Selling Open-Source Software

There is a wide misperception that open-source software means free (as in price) software. The GPL has no requirements about how much can be charged for distributing a copy of free-speech software, with the exception of where compiled binaries are distributed without the complete source code (which doesn’t apply to Shopp).

For more details about the GPL, free-speech software and why Shopp decided on it, check out some of the following resources:

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