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The GNU General Public License (GNU GPL or simply GPL) is a series of widely used free software licenses that guarantee end users the four freedoms to run, study, share, and modify the software.

How to Use GNU Licenses for Your Own Software Get a copyright disclaimer from your employer or school. Give each file the proper copyright notices. ... Add a COPYING file with a copy of the GNU GPL or GNU AGPL. Also add a COPYING. ... Put a license notice in each file. (Optionally) make the program display a startup notice.

Using the Licensed Code Use the code commercially. Companies can include BSD'd code in proprietary software that they then sell to the public. Modify the code. Developers are permitted to update or rework the original code. Distribute reworked versions or copies of the code. ... Place warranty.

In the file name field, type LICENSE or LICENSE.md (with all caps). Under the file name, click Choose a license template. On the left side of the page, under "Add a license to your project," review the available licenses, then select a license from the list. Click Review and submit.

To add license checking to a Python application you import the Licensing.py file into your application. You can then call the checkLicense function by calling Init to load the license information and check that the user has a valid license.

To release software under GPL licenses, users need to obtain a copyright disclaimer from any superseding entity like an employer or school. Once the disclaimer is in place, each file should receive the proper copyright notices while clearly defining what versions users can use.

The GNU General Public License (GNU, GPL, or GPL) is a free software license originally written by Richard Stallman of the Free Software Foundation, which guarantees that users are free to use, share, and modify the software without paying anyone for it.