This means:
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You are free to use, study, modify and redistribute SKLang.
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If you distribute a modified version of the compiler, interpreter, or build tool, you must also distribute the source code under the same GPLv3 license.
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Derivative works of the SKLang compiler or interpreter must remain open-source under GPLv3.
Programs written in SKLang are not subject to the GPL license of the compiler or interpreter.
You are free to use SKLang to build proprietary, commercial, or closed-source software.
The GPL applies only to the SKLang compiler, interpreter, and official tooling — not to code compiled with it.
The official SKLang repository is maintained solely by its original author to guarantee long-term stability and compatibility.
Forks are permitted under the GPLv3 license. However, changes made in forks do not represent the official SKLang specification.