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The underlying software is free and open-source: https://github.com/nikopueringer/CorridorKey2.0

The commercial package primarily consists of commercially supported plugins.

Clarification required as the project is NOT open source following OSI definition[1]. It should be advertised as source available as the license is restrictive in how you may use the software.

[1] https://opensource.org/education/what-is-open-source

They explicitly call that out and mention if folks want to use it for paid projects, to just reach out. Thats a caveat obviously, but the intentions seem noble

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