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licences_and_dependencies
i have chosen to license r_e_c_u_r's software under GPL-3.0 for the following reasons:
- i agree with the copy-left philosophy and want to empower the users, ensuring it remains (as intended) an open community project.
- although i have not modified any existing open-source projects to create r_e_c_u_r , it does run on top of many dependencies, some of which have GPL licenses (omxplayer in particular). i wish to respect the sentiment of these developers, even if not required legally.
- for low-level utility tools with numerous, varied uses, a permissive open-source licence like MIT can empower other developers to create and license without restrictions. however r_e_c_u_r is an embedded top level application that is unlikely to be useful in any other context
this licence only applies to the code in this repo. see below for a list of external programs that r_e_c_u_r uses and their respective repos/sites for more information.
besides the application code licensed above , i would like all original hardware designs licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. this includes the enclosure design , extension pcb project, custom key stickers and assembly. it does not apply to, and i am not the copyright holder for Raspberry Pi 3 Model B , 3.5 Inch TFT LCD Module For Raspberry Pi , Generic Wireless USB Numeric Keypad or any other third party extension / accessory.
| dependency | use | licence |
|---|---|---|
| rasbian | the os on pi | based on debian , made up of different licensed programs |
| python | lanuage | open-source , gpl-compatible |
| omxplayer | the media player | GPL-2.0 |
| omx python wrapper | for controlling omxplayer | LGPL |
| dbus-python | dependency for omx wrapper | permissive, non-copyleft |
| tkinter | the ui display | BSD |
| picamera | interface with capture | BSD |
| mido | interface with midi | MIT |
| python-rt-midi | midi backend | MIT / modified MIT |
| gpac (mp4box) | creating mp4 file | LGPL |
| git | used to install and update | GPL-2.0 |
v2 adds openframeworks and a bunch of ofx extensions to this dependency list : - fill this out -
i have not modified any of the programs that are used in recur. they are all being used either under a permissive license or as part of the operating system. i can license my program however i choose, i can not license (for example) an img that contained gpl-2.0 programs with a non gpl compatible license.
there are no restrictions on selling a product under any of these licenses. in fact non-commercial licencees are not open-source
some interesting discussion around difference between modifying a gpl program and using one as a dependency ,
- if it is part of the os it is ok.
- if it is not 2-way interacting / sharing data structures etc - just an input -> output usage it is ok
there is no restrictions to permissive installer scripts downloading gpl licensed programs
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