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@@ -77,6 +77,11 @@ The difference between a package being unsupported on some system and being brok
 
 ## Installing unfree packages {#sec-allow-unfree}
 
+All users of Nixpkgs are free software users, and many users (and developers) of Nixpkgs want to limit and tightly control their exposure to unfree software.
+At the same time, many users need (or want) to run some specific pieces of proprietary software.
+Nixpkgs includes some expressions for unfree software packages.
+By default unfree software cannot be installed and doesn’t show up in searches.
+
 There are several ways to tweak how Nix handles a package which has been marked as unfree.
 
 -   To temporarily allow all unfree packages, you can use an environment variable for a single invocation of the nix tools: