Most of the Free Logos posted here are under Attribution Creative Common License. That means you are free to use them, make derivate works and re publish them as long as you give credit to the author. In case of the Logos templates done by Logo Open Stock in case you use them in a web project for example, you've to link back to us (do follow link) in your site. This would be as follows:
Logo design by Logo Open Stock
If you want to use a logo without giving us attribution please contact us .
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There are six major licenses of the Creative Commons (and available in this site) are:
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The GNU General Public License (GNU GPL or simply GPL) is a widely used free software license, originally written by Richard Stallman for the GNU project.
The GPL is the most popular and well-known example of the type of strong copyleft license that requires derived works to be available under the same copyleft. Under this philosophy, the GPL grants the recipients of a computer program the rights of the free software definition and uses copyleft to ensure the freedoms are preserved, even when the work is changed or added to. This is in distinction to permissive free software licenses, of which the BSD licenses are the standard examples.
Read more about General Public Licenses directly in its site: www.gnu.org