In general the Qt licensing is as follows: You can create a commercial app with Qt of a library that dynamically links to it if you want so. The Community Edition is distributed under LGPL, so you don't need to release your source code but has to provide a reasonable way to download Qt. If you change/patch Qt Community Edition itself then you must offer your modifications under the LGPL. Some extra Qt modules are GPL licensed, and to distribute your program linked with GPL modules you must license it under GPL too, meaning that you must provide the source code of your program under the aforementioned license.. Depending on what Qt version you're using, such modules may be available under GPL2 or GPL3. Newest ones (as of Qt 5.7) are GPL3. If you don't intend to distribute your code, and the compiled program is for your own personal, individual, exclusive use only, then you don't need to release anything. If you want to develop open source software, you must choose a license compatible with LGPL/GPL, If you intend to do so using a license other than GPL, LPGL, MIT, BSD or Public Domain, you should check with someone more knowledgeable, like a Lawyer. Some open source licenses are incompatible with GPL. Apache License is one to avoid. Besides Qt, every single other library you intend to use must have its license compatibility assessed. As an example, Steinberg's VST Library has a license totally incompatible with GPL. LMMS is able to use VST instruments because of Vestige, that doesn't use code from Steinberg.
Happy hacking! Cláudio P.S.: Sorry for the previous email. I'm a bit odd today. :) 2016-08-24 10:47 GMT-03:00 Tres Finocchiaro <tres.finocchi...@gmail.com>: > > I was wondering a) what constitutes a working knowledge of C++ for >> developing >> > > Some of the most active devs today don't have a C++ background, so this > varies greatly. There's no barrier to entry really, just good PRs, and > they don't have to be good at first, just have to be good before being > merged. > > >> > b)what the most favored IDE is >> > > Qt Creator, unofficially. > > QtCreator Initial loading > http://youtu.be/XTWnQPGL9xs > > QtCreator tips > http://youtu.be/3OzGXfm6fqE > > > > > >> > c) if any of the legal stipulations involved with the Open Source >> licensed Qt Creator are worth worrying about >> > > After reviewing the FAQ on Qt's website, it doesn't look like it. When > using the Community Edition of the software (non-commercial) they offer > LGPL and GPL options, but I'll have to defer this question to someone like > Javier Serrano Polo (@jasp00). > > Welcome, we look forward to the help! > > We have 463 open bug reports <https://github.com/LMMS/lmms/issues>, we > could use some bug squashers. :) > > -Tres > > ------------------------------------------------------------ > ------------------ > > _______________________________________________ > LMMS-devel mailing list > LMMS-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/lmms-devel > >
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