Strong Licence Examples

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  Provides copyright protection Can be used in commercial applications Copyfree Provides explicit patent licence Can be used in proprietary solutions Copyleft Additional notes
Creative Commons Attribution 3.0 Unported License Yes Yes No No No Limited Not recommended for use with software
Creative Commons Attribution-Share Alike 3.0 Unported License Yes Yes No No No Strong Not recommended for use with software
GNU Affero General Public License 3.0 (AGPLv3) Yes Yes No Yes No Strong Based on the GNU General Public License 3.0

Extends copyleft conditions to software used over a network or website
GNU General Public License 2.0 (GPLv2) Yes Yes No No No Strong  
GNU General Public License 3.0 (GPLv3) Yes Yes No Yes No Strong Based on the GNU General Public License 2.0