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Re:XSV: A fast CSV command-line toolkit written in Rust by dj43nq on Monday September 10, 2018 @12:46PM (#17953081)
QT seems interesting.

For those like me who’ve never used QT: As long as you don’t statically link the QT libraries you don’t have to open source your entire commercial application. I’m not a lawyer.

General notes about licensing https://www1.qt.io/licensing/

Comparison of licenses https://www1.qt.io/licensing-comparison/

Re:XSV: A fast CSV command-line toolkit written in Rust by jcelerier on Tuesday September 11, 2018 @05:56AM (#17958346)
> As long as you don’t statically link the QT libraries you don’t have to open source your entire commercial application

I provided a link from the FSF that shows that this is not the case just below - you can statically link proprietary apps with LGPL qt.

Re:XSV: A fast CSV command-line toolkit written in Rust by dj43nq on Tuesday September 11, 2018 @09:12PM (#17964818)
“(1) If you statically link against an LGPL'd library, you must also provide your application in an object (not necessarily source) format, so that a user has the opportunity to modify the library and relink the application.”

So for LGPL. As a commercial application developer I’m not sure I’d want to do that. I’d then have to field support requests for that object file.

Still, good to know.