The four freedoms

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 title: The four freedoms
 weight: -10
 ---
+
+<blockquote>
+  <ol start="0">
+    <li>
+      The freedom to <strong>use</strong> the software for any purpose.
+    </li>
+    <li>
+      The freedom to <strong>study</strong> and <strong>improve</strong> the
+      software.
+    </li>
+    <li>
+      The freedom to <strong>share</strong> the software.
+    </li>
+    <li>
+      The freedom to <strong>collaborate</strong> on the software.
+    </li>
+  </ol>
+</blockquote>
+
+Let's examine each of the four freedoms in more detail.
+
+## 0: Use the software
+
+The first freedom guarantees the right for everyone to **use** the software for
+any purpose. You are entitled to the use of any free software for any reason,
+including commercial use -- counter-intuitively, you can sell free software. You
+can also incorporate free software into your own work, but be careful -- there
+are some gotchas here, which we cover under [use & reuse](/learn/use/).
+
+{{< tip >}}
+In free software lingo, this is often called the "non-discrimination" clause.
+{{< /tip >}}
+
+## 1: Study and improve the software
+
+The second freedom guarantees the right to **study** the program's behavior. You
+have a right to understand how the software you depend on works! In order to
+facilitate this, the *source code* of free software must be published. The
+publishers of free software cannot obfuscate the source code, forbid reverse
+engineering, or otherwise prevent you from making use of it.
+
+Moreover, you have a right to **improve** the source code. You are not only
+given the right to read the source code of free software, but also to change it
+to better suit your needs.
+
+## 2: Share the software
+
+The third freedom guarantees the right to **share** free software with others.
+If you have a copy of some free software, you can give it to your friends, or
+publish it on your website, or bundle it with other software and share it as
+part of something bigger. You can also share your improvements to it -- then
+it's better for everyone!
+
+## 3: Collaborate on the software
+
+The fourth freedom guarantees one additional right: the right to **collaborate**
+with others on improving the software. You can study, improve, and share the
+source code, and the people you share it with can study, improve, and share it
+right back with you. This is the foundation of the **Free Software Movement**: a
+global community of software enthusiasts sharing and improving software
+together.
+
+{{< button "/learn/licenses" "Next: Free software licenses" "next-button" >}}