Theme Licensing — a practical guide to WordPress theme GPL licensing with clear examples you can reuse in real projects.
WordPress Theme Development Series (87/96). Prefer one article? Read the complete WordPress theme development tutorial.
Short description
WordPress.org requires GPL-compatible licensing for PHP (and typically bundled assets guidelines).
License header
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html