License for commercial software
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I want to develop a commercial paid desktop app with Qt. I've heard that I were to use GPL modules I would have to publish source code of my app to the customers, so I would only use LGPL ones.
Now, could I license my app under a license different than LGPL. -
Hi,
Warning: I am not a lawyer.
You can keep your sources to you when using LGPL however you have to provide an easy to reach place in your application where you acknowledge the use of LGPL libraries. For example in an about box. Qt provides an aboutQt slot that shows that information for Qt itself for example.
Also, your application users shall be able to swap your LGPL dependencies for their own versions.
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Hi,
Warning: I am not a lawyer.
You can keep your sources to you when using LGPL however you have to provide an easy to reach place in your application where you acknowledge the use of LGPL libraries. For example in an about box. Qt provides an aboutQt slot that shows that information for Qt itself for example.
Also, your application users shall be able to swap your LGPL dependencies for their own versions.
@SGaist Ok, but does using LGPL Qt force me to license whole app under LGPL?
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@SGaist Ok, but does using LGPL Qt force me to license whole app under LGPL?
@michal-19937 Your application is a "Combined Work" under the LGPL: "You may convey a Combined Work under terms of your choice that, taken together, effectively do not restrict modification of the portions of the Library contained in the Combined Work and reverse engineering for debugging such modifications." See Section 4 of the appropriate version(s) of the LGPL for your obligations.
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@michal-19937 Your application is a "Combined Work" under the LGPL: "You may convey a Combined Work under terms of your choice that, taken together, effectively do not restrict modification of the portions of the Library contained in the Combined Work and reverse engineering for debugging such modifications." See Section 4 of the appropriate version(s) of the LGPL for your obligations.
@ChrisW67 Thank you for response. Just to clarify, conveying under "terms of your choice" means conveying under any license I want?
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@ChrisW67 Thank you for response. Just to clarify, conveying under "terms of your choice" means conveying under any license I want?
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@michal-19937 Your part of the work can be under any license you like but the Library remains under the LGPL and you have to provide a way for your users to substitute an alternate version etc.
I am not a legal professional.
Alright, thank you.
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M michal.19937 has marked this topic as solved on
