In my case I am interested in holiday dates across world.
I found some programs/datasets that claim to be under various licences but ultimately ones I seen take lists of holidays from Wikipedia pages.
Can I use these to filter/preprocess data to be imported into OSM?
Looking at Wikipedia:Reusing Wikipedia content - Wikipedia Wikipedia text is CC-BY-SA 4.0 licensed.
Looking at Use of CC BY 4.0 licensed data in OpenStreetMap | OpenStreetMap Blog I would need to get waiver, that seems impossible to get.
So it seems that doing things like
- read Wikipedia articles and extracts lists of holidays dates across world
- use this data to filter/modify another dataset
- import that dataset into OSM
seems not OK.
Also when first step is replaced by “lets find another project doing this and releasing this dataset under a different license than CC-BY-SA 4.0”.
So it seems if I need such dataset then I would need to build it myself or find another source (if you know any that is not based on Wikipedia please let me know).
Or is there a good reason to expect that it is actually not a problem? Maybe because it is collection of facts so it is definitely fine to do this?
Note: I am not looking at “can I get away with it” advise.
Note: I am not a lawyer and I know that none of people commenting here can give proper legal advise. But I am not a milionaire and I do not have a copyright lawyer subscription and I prefer to ask on osm forum rather than guess based purely on my knowledge. I may try asking further in more ualified places but I first want to check whether I missed something obvious.