Using Ocular engine in educational commercial software?

[Albert Astals Cid]

El dilluns, 5 d’abril de 2021, a les 13:26:31 CEST, Energo Koder va escriure:
> Hi!

Hello.

> I have idea for educational application. This app will be similar to 
> SuperMemo (periodic card based reminder).
> Essential is high quality and durability of content. So I want to use 
> vector based file format in order to be free of increased DPI in the future.
> I know that in advent of KDE5 its developers make huge mind step and 
> make tons of specialized libraries in order to allow people using them 
> in they apps.
> 
> So I want to use Ocular engine. This brings to me few questions:
> 1. Is this possible in theory?

Your 2 sentence description is very vague, so maybe? don't know? no idea, and to be honest, don't really care.

> 2. Is it possible for commercial project?

Okular core is GPL2+, if you use okular you need to abide to that license, if by "commercial" you mean you don't want to release the source code under a GPL2+ compatible license, no, it's not possible.

Albert

> 3. How should I start? Can you give me some hints what core libs are 
> named? What Ocular libs are used for?
> 4. Where is the best source of developer information?
> 5. Can I expect that KDE Ocular libs will be works (at least in theory) 
> on WinDos, MacOS, Tablets (with Android and IOS)?
> 
> Please don't mid that I am greedy. I am aware that good things will be 
> better when I pay for them. So two years ago I start annually pay for 
> use full software (for example in the end of 2020 I donate KDE and 
> Kubutnu about 50$ each, among other opensource projects).
> This fund can be raised when my income from open source will also 
> raised. I think this is honest and sensible approach.
> 
> Thanks in advance and best regards!
> Energo Koder
>