Should I buy a license?

Danila Medvedev

Hello,
I have been selling and developing the Neyrocode program (http://neyrokod.info) using the QT library since 2011. I didn't buy the QT library. I haven't opened the source code of the program and I'm not going to. I registered the rights to the program here https://www1.fips.ru/fips_servl/fips_servlet?DB=EVM&DocNumber=2018616469&TypeFile=html I would like to clarify whether my activities are legal, and if not, is QT Company able to do anything to me if I am in Russia?

raven-worx

@Danila-Medvedev said in Should I buy a license?:

I haven't opened the source code of the program and I'm not going to.

then you already know the answer i assume no? ~~closed source = buy license~~

is QT Company able to do anything to me if I am in Russia?

sure, why not?!

Chris Kawa

@raven-worx said:

closed source = buy license

That's not exactly true. If you use LGPL you don't have to open your source. You need to open only any modifications to the Qt library itself and provide a way to let the user re-link with their own version of Qt. That's usually achieved via shared libraries.

@Danila-Medvedev said:

I registered the rights to the program

That's irrelevant for the subject of Qt licensing.

I would like to clarify whether my activities are legal

I am not a lawyer and this is not a legal advice, but probably not at this time. Since you didn't bother to check the license terms there's little hope you're following them by accident. Apart from the requirements I mentioned above there are some other terms you need to meet to use LGPL like distributing a copy of the license with your app.

and if not, is QT Company able to do anything to me if I am in Russia?

Well if you're afraid of that then posting on Qt's forum a link to your website after a decade of illegally distributing your app is not very smart right? That's basically theft, and, as far as I know, Russia does have laws against it like most other countries.

raven-worx

@Chris-Kawa said in Should I buy a license?:

That's not exactly true.

right, i was too fast with that answer.