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+# DPF - DISTRHO Plugin Framework
+
+Even though DPF is quite liberally licensed, not all plugin formats follow the same ideals.  
+This is usually due to plugin APIs/headers being tied to a specific license or having commercial restrictions.  
+This file describes the licensing that applies to each individual plugin format as a way to make it clear what is possible and compatible.
+
+Regardless of target format, DPF itself needs to be mentioned in attribution.
+See the [LICENSE](LICENSE) file for copyright details.
+
+| Target          | License(s)           | License restrictions  | Additional attribution |
+|-----------------|----------------------|-----------------------|------------------------|
+| JACK/Standalone | MIT (RtAudio)        | Copyright attribution | **RtAudio**: 2001-2019 Gary P. Scavone |
+| LADSPA          | LGPLv2.1+            | ??? (*)               | 2000-2002 Richard W. E. Furse, Paul Barton-Davis, Stefan Westerfeld |
+| DSSI            | LGPLv2.1+            | ??? (*)               | **DSSI**: 2004, 2009 Chris Cannam, Steve Harris and Sean Bolton;<br/> **ALSA**: 1998-2001 Jaroslav Kysela, Abramo Bagnara, Takashi Iwai |
+| LV2             | ISC                  | Copyright attribution | 2006-2020 Steve Harris, David Robillard;<br/> 2000-2002 Richard W.E. Furse, Paul Barton-Davis, Stefan Westerfeld |
+| VST2            | BSD-3                | Copyright attribution | 2020-2022 Michael Fabian 'Xaymar' Dirks |
+| VST3            | ISC                  | Copyright attribution | (none, only DPF files used) |
+| CLAP            | MIT                  | Copyright attribution | 2014-2022 Alexandre Bique |
+
+### LADSPA and DSSI special note
+
+The header files on LADSPA and DSSI are LGPLv2.1+ licensed, which is unusual for pure APIs without libraries.  
+LADSPA authors mention this on ladspa.org homepage:
+
+> LADSPA has been released under LGPL (GNU Lesser General Public License).
+> This is not intended to be the final license for LADSPA.
+> 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.
+> It may be that LGPL is already free enough for this, but we aren't sure.
+
+So the situation for LADSPA/DSSI plugins is unclear for commercial plugins.  
+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.
+
+### VST2 special note
+
+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.  
+Previously "vestige" was used, but was problematic due to it being GPLv2 licensed.  
+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.
+
+### VST3 special note
+
+Contrary to most plugins, DPF does not use the official VST3 SDK.  
+Instead, the API definitions are provided by the [travesty](distrho/src/travesty/) sub-project, licensed in the same way as DPF.
+This allows us to freely build plugins without being encumbered by restrictive licensing deals.  
+It makes the internal implementation much harder for DPF, but this is not an issue for external developers.