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Not sure if this is for all the products but this is found on the main page.

Licensing

Cheerp is free open-source software, actively developed and maintained by Leaning Technologies. Commercial support, feature fast tracking, sponsored development and consulting packages are available for Enterprise customers.

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Looks like all the products have a different licenses

https://cheerpj.com/licensing/

The X version seems to be minified CDN hosted .js file but no other info about usage. The only comment in the file indicates that its some sort of C/C++ file presumable ported over to JS

/Compiled using Cheerp (R) by Leaning Technologies Ltd/

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