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Add LICENSE
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Copyright (c) Vitaliy Filippov (vitalif [at] yourcmc.ru), 2019+
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All server-side code (OSD, Monitor and so on) is licensed under the terms of
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Vitastor Network Public License 1.1 (VNPL 1.1), a copyleft license based on
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GNU GPLv3.0 with the additional "Network Interaction" clause which requires
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opensourcing all programs directly or indirectly interacting with Vitastor
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through a computer network and expressly designed to be used in conjunction
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with it ("Proxy Programs"). Proxy Programs may be made public not only under
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the terms of the same license, but also under the terms of any GPL-Compatible
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Free Software License, as listed by the Free Software Foundation.
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This is a stricter copyleft license than the Affero GPL.
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Please note that VNPL doesn't require you to open the code of proprietary
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software running inside a VM if it's not specially designed to be used with
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Vitastor.
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Basically, you can't use the software in a proprietary environment to provide
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its functionality to users without opensourcing all intermediary components
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standing between the user and Vitastor or purchasing a commercial license
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from the author 😀.
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Client libraries (cluster_client and so on) are dual-licensed under the same
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VNPL 1.1 and also GNU GPL 2.0 or later to allow for compatibility with GPLed
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software like QEMU and fio.
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You can find the full text of VNPL-1.1 in the file [VNPL-1.1.txt](VNPL-1.1.txt).
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GPL 2.0 is also included in this repository as [GPL-2.0.txt](GPL-2.0.txt).
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