License

Arsyn is free to use and closed source. This page says plainly what you can and cannot do, and where the line between open and closed sits. It is a summary — the binding text ships in the LICENSE file with the application.

You are free to

• Use Arsyn for any purpose, including commercially, at no cost.
• Install it on as many machines as you like — there is no seat count and no activation.
• Keep and read your own project data: the .arsyn format is documented.
• Write, use and sell your own modules against the module SDK.

You may not

• Decompile, reverse-engineer or redistribute the application core.
• Resell Arsyn itself, or bundle it into a product you sell, without a written agreement.
• Use the "Arsyn" name or logo to imply endorsement of your own product.

What is open, and what is not

Arsyn is not an open-source project and does not claim to be. The core — 3D engine, CAD, wiring, simulation — is closed and stays closed. What is planned for publication is the extension surface, so that your work is not trapped if Arsyn disappears:

Module SDK not published yet

The API modules register against, the module loader contract, and working example modules.

.arsyn file format not published yet

Full specification of the project file, so your data is readable without Arsyn installed.

Ars language & compiler not published yet

The automation language, its grammar, and the compiler that lowers it to vendor backends.

Application core closed

The 3D engine, CAD, wiring and simulation code stay closed. Free to use, not published.

Contributions & modules

Modules you write are yours. By submitting one to the public library you confirm you have the right to share it and allow us to distribute it there; you keep every other right, including the right to sell it elsewhere. Third-party brands referenced in lessons remain their owners' property.

No warranty

Arsyn is provided "as is", without warranty of any kind. To the maximum extent permitted by law, the author is not liable for any damage arising from its use. This matters more than usual here: Arsyn is pre-release software intended to touch industrial equipment. Do not put it in the path of anything that can hurt someone or break something expensive.

Arsyn is free of charge. It is not free software, and not open source, under any accepted definition of either term. If that is a dealbreaker for you, it is better that you know now than after you have built a project on it.