What Is The Most Open License?
Top open source licenses by risk
What are the types of open source license?
Open Source Licenses Explained | Mend
What is the most free license?
As of 2016, the most popular free-software license is the permissive MIT license.
Permissive software license - Wikipedia
What is the most restrictive open source license?
One of the most common restrictive licenses is the GNU GPL (General Public License).
Guide to open source licenses: Use, obligations, and risk - Synopsys
What license is least restrictive?
The least restrictive would be the “Attribution” license, which means that as long as people credit you, they can do whatever they like with the work. CC licenses are used more for design work than development, but nothing bars you from using it for the latter.
A Short Guide To Open Source Licenses - Smashing Magazine