The freedom to run the program for any purpose.
The freedom to study how the program works and adopt it to your needs. Access to the source code is a precondition for this.
The freedom to redistribute copies so you can help your neighbour.
The freedom to improve the program and release your improvements to the public so that the whole community benefits. Access to the source code is a precondition for this (www.gnu.org/philosophy/free-sw.html).