So here's the situation: I built a database (text file) that consists of a few sets of data (for example, but not really), "car name", "car parts", etc.
The "car name" data and others are under no copyright, but for "car parts", I used two others sources of data, one licensed under Apache License 2.0, LGPLv3 and CC BY-SA 3.0, the other under GPLv2.
I then compared the two sets of data, one by one, manually, and selected certain "car parts" from one source, certain "car parts" from the other source and merged the two together (although I changed the formatting/layout), and sometimes I simply copied the data from one source intact and only changed the formatting/layout, and sometimes I simply edited the original data by removing or including certain other "car parts" myself (and, again, changed the formatting/layout). I also did a lot of fixing of errors, etc.
I then added additional sets of data in the other fields.
Now, my question is, because I manually built my custom dataset with the help of two open-sourced databases (which do not resemble my database any longer), do I absolutely must share this dataset publicly and make it available for all? The thing is, these particular "car parts" that I've selected and my custom formatting is something innovative and gives me an advantage over other people's projects who simply use one of the two open-sourced databases unchanged and in their original form.
I would like to make all this data publicly available and freely accessible to everyone via a website or app (free), but I don't want to make the dataset itself downloadable in its text form, because the goal of my project is to be innovative and offer unique new features, and I don't want some random competitive project to incorporate my hundreds of hours of research and data into theirs, essentially making my unique project just another "clone".
So what are my options, considering the mentioned licenses were never meant for (textual) data, but software and graphics/media, etc., and I am making my data freely available and accessible via a website/app for everyone - I just don't want to share the source database as a download?