The terms of a proprietary license are unjust

Proprietary software is offered to the user under unjust terms.
The proprietor has no right to demand the user's freedom in exchange for using the software.
All software is inevitably free/libre or proprietary/non-free. This is not a false dichotomy.
Free/Libre software is software that respects the user's freedom. Software that meets the "4 Freedoms" is considered free/libre. The free software movement was started by Richard Stallman to to pursue the liberation of cyberspace. To create a free digital world for computers users.
Richard Stallman started the GNU project to develop an operating system for this, and pioneered the concept of copyleft with their GNU GPL license. Copyleft is a specific kind of a free/libre license that guarantees the user's freedom is preserved when the software exchanges hands.
Visit GNU.org www.gnu.org
Fight for software freedom, let the liberation of cyberspace prevail!