How can you quickly tell whether an application is free software or nonfree?
Well, one way is to check what the software is licensed under!
Roughly, a license can tell what users can and can't do.
The recommended free licenses are the GNU General Public License, version 3 (GPLv3) or the GNU Affero General Public License, version 3 because they are copyleft licenses. We will get into copyleft later.
The list of free licenses are here: https://www.gnu.org/licenses/license-list.html
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A instance dedicated - but not limited - to people with an interest in the GNU+Linux ecosystem and/or general tech. Sysadmins to enthusiasts, creators to movielovers - Welcome!