A licence that does not get in your way
INDIGO is released under the INDIGO Astronomy open-source license, a BSD style, business friendly licence. You can use the framework in a commercial product, keep your own code closed and ship it however you like, as long as the copyright notice and the disclaimer travel with it.
No GPL code is used anywhere in the framework, and that is a deliberate design requirement rather than an accident. It means INDIGO can be linked into applications that are distributed through the Apple, Microsoft and other application stores, where copyleft licences are a problem, and it means integrating INDIGO puts no licensing obligations on the rest of your product.
This is INDIGO license if you want to use the code
INDIGO Astronomy open-source license (version 2.0, December 2020)
Copyright (c) 2020 CloudMakers, s. r. o.
Copyright (c) 2020 Rumen G.Bogdanovski
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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Redistribution in source or binary form for fee is permitted only as part of another different product or as product derived from this software.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.