What is the GNU General Public License (GPL)?
The GNU General Public License (GPL) is a license issued from the Free Software Foundation with a copyleft for licensing free software. As integral parts of the license, GPL grants the following four freedoms to everybody: • The program can be used without any limitations and for every purpose. It is explicitly permitted to use the software commercially. • Copies of the program may be distributed free of charge or with costs as long as the source code is delivered as well or is made available upon request to the recipient of the program at cost price. The recipient has the same liberties as the provider, e.g. anybody buying a copy has the right to distribute it commercially or free of charge. No license fees may be charged. Nobody is obliged to distribute copies, neither at large nor to any specific person, but if doing so, these rules must be obeyed. • The functioning of the program may be studied and adapted to individual needs. • Also modified versions of this program may be distrib
