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author prymula <prymula76@outlook.com>
date Wed, 31 Jan 2024 20:40:57 +0100
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1 # DPF - DISTRHO Plugin Framework
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3 Even though DPF is quite liberally licensed, not all plugin formats follow the same ideals.
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4 This is usually due to plugin APIs/headers being tied to a specific license or having commercial restrictions.
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5 This file describes the licensing that applies to each individual plugin format as a way to make it clear what is possible and compatible.
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7 Regardless of target format, DPF itself needs to be mentioned in attribution.
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8 See the [LICENSE](LICENSE) file for copyright details.
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10 | Target | License(s) | License restrictions | Additional attribution |
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11 |-----------------|----------------------|-----------------------|------------------------|
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12 | JACK/Standalone | MIT (RtAudio) | Copyright attribution | **RtAudio**: 2001-2019 Gary P. Scavone |
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13 | LADSPA | LGPLv2.1+ | ??? (*) | 2000-2002 Richard W. E. Furse, Paul Barton-Davis, Stefan Westerfeld |
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14 | DSSI | LGPLv2.1+ | ??? (*) | **DSSI**: 2004, 2009 Chris Cannam, Steve Harris and Sean Bolton;<br/> **ALSA**: 1998-2001 Jaroslav Kysela, Abramo Bagnara, Takashi Iwai |
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15 | LV2 | ISC | Copyright attribution | 2006-2020 Steve Harris, David Robillard;<br/> 2000-2002 Richard W.E. Furse, Paul Barton-Davis, Stefan Westerfeld |
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16 | VST2 | BSD-3 | Copyright attribution | 2020-2022 Michael Fabian 'Xaymar' Dirks |
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17 | VST3 | ISC | Copyright attribution | (none, only DPF files used) |
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18 | CLAP | MIT | Copyright attribution | 2014-2022 Alexandre Bique |
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20 ### LADSPA and DSSI special note
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22 The header files on LADSPA and DSSI are LGPLv2.1+ licensed, which is unusual for pure APIs without libraries.
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23 LADSPA authors mention this on ladspa.org homepage:
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25 > LADSPA has been released under LGPL (GNU Lesser General Public License).
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26 > This is not intended to be the final license for LADSPA.
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27 > In the long term it is hoped that LADSPA will have a public license that is even less restrictive, so that commercial applications can use it (in a protected way) without having to use a derived LGPL library.
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28 > It may be that LGPL is already free enough for this, but we aren't sure.
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30 So the situation for LADSPA/DSSI plugins is unclear for commercial plugins.
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31 These formats are very limited and not much used anymore anyway, feel free to skip them if this situation is a potential issue for you.
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33 ### VST2 special note
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35 The DPF's VST2 implementation uses https://github.com/Xaymar/vst2sdk which is a liberally-licensed "clean room" untainted reverse engineered "SDK" for the VST2 interface.
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36 Previously "vestige" was used, but was problematic due to it being GPLv2 licensed.
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37 With the Xaymar's work, both open-source and proprietary plugins can be created from the same source, which helps in maintenance on DPF side.
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39 ### VST3 special note
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41 Contrary to most plugins, DPF does not use the official VST3 SDK.
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42 Instead, the API definitions are provided by the [travesty](distrho/src/travesty/) sub-project, licensed in the same way as DPF.
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43 This allows us to freely build plugins without being encumbered by restrictive licensing deals.
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44 It makes the internal implementation much harder for DPF, but this is not an issue for external developers.