> If someone uses code licensed under the GPL and makes it better, they must also share their improved code with others under the same license. That is not cop

> If someone uses code licensed under the GPL and makes it better, they must also share their improved code with others under the same license. That is not copyleft! You are not obligated to share any creation with anyone else! Quoting https://www.gnu.org/philosophy/free-sw.en.html#redistribute https://www.gnu.org/philosophy/free-sw.en.html#redistribute: "You should also have the freedom to make modifications and use them privately in your own work or play, without even mentioning that they exist." You absolutely do not need to "share your new creation" with anyone else. It's only that if you do share or sell your creation, it must also be under the terms of the GPL.