Is license need for free wordpress plugin

If you plan on submitting the plugin to the WordPress Repository then it is not technically required but by submitting it you automatically agree that the entire plugin is “considered GPLv2 or later.” – The Plugin Handbook says this in regards to Plugins added to the Repository

1) Your plugin must be compatible with the GNU General Public License
v2, or any later version. We strongly recommend using the same license
as WordPress — “GPLv2 or later.”

Note: This rule applies to everything in the plugin. This includes code, data, and images, even if you did not create that particular
piece. All third-party libraries must also be compatible. For a
specific list of compatible licenses, please read the GPL-Compatible
license list on gnu.org. Double check your licensing before you start
writing your plugin.

2) If you don’t specify a compatible license (such as in a
license.txt file or referencing or declaring a license somewhere in
the code or readme.txt file), what you check in is considered GPLv2
or later. By committing code to our repository at all, you accept
this condition.

Also from the handbook, here’s some instructions on including a license: Including a Software License

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