GPL: If you are integrated into your own software using others, your own software automatically follows the GPL protocol, which must allow anyone to use your software free of charge. For your own program source code, you can distribute it free of charge, or you can charge a certain fee.
LGPL: Mainly used for some library functions, designing its original intention is to allow it to be used by some commercial software to expand its application range. Software that can be used to follow the LGPL protocol, as long as this function is taken at different times, the software is designed to comply with the LGPL protocol (for commercial purposes).
Apache Software License: You can use the software that follows the Apache protocol, as long as you contain the following text: "This Product Includes Software Developation by the Apache Software Foundation <
Http://www.apache.org/>. "In other words, as long as you say thank you, you can use its software, even develop your own software and then sell it to apache (^ _ _ ^).
