Software licenses are usually distributed as a text file within the installation package or communicated while the software is being installed.
GNU General Public License
A common license given to free software is the GNU General Public License (GNU GPL or GPL). GPLs are used allowing software to be used, studied, shared (copied) and modified – as long as its stays free. This license is part of the “copyleft” license group as it stipulates that the same rights are to be reserved down the line.
The GPL requires software to be free of charge, despite of the way the software is distributed. Even though GPL code can be sold, it is not possible for proprietary software to derive from it.
One step lower than the GPL license is the BSD license. This license basically places the software the public domain with a clause stating that the endorsement of any derivative work cannot be made to the name of the original copyright owner.
one of the most open licenses, since it basically puts the work under public domain. There are no restrictions or limitations, except demanding that the full copyright notice, which declares no warranty or liability, is included.
: similar to the MIT License, except for the fact that there is a clause stating that the endorsement of any derivative work cannot be made to the name of the original copyright owner.
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