Feel free (or I will) to add this to my open patch and will swat later

@Santasa99: In the future, please follow the link in https://commons.wikimedia.org/wiki/Commons:Upload_tools/wgCopyUploadsDomains - thanks!

@Aklapper you mean, not to post directly here? Of course, no problems! But out of curiosity - I came to this place for the first time, I mean with a previous post, but, essentially, I'm doing this for the first time, and I had no idea that, for some reason, I should have followed the link from there, if that's what you're telling me - that there is some reason why I need to follow the link from there next time ?

Andre meant that you should use the request button at https://commons.wikimedia.org/wiki/Commons:Upload_tools/wgCopyUploadsDomains, it prefills the form with some data :).

https://digi.ub.uni-heidelberg.de/diglit/dioezarchivschwab1892/0093/image has this icon:

unless I'm missing something, it means "all rights reserved". I'd need a different example.

This is surprising - the same document is given under 3.0 / 4.0 by deutsche-digitale, yet here is Free Access/All right reserved.
Now, there is no doubt that I could find example with 3.0 / 4.0, but I am not sure anymore that such docs are available in one place, like in above mentioned library, where all these old newspapers are given in one place with same licence.
Here's what the Uni digital lib says:
https://www.ub.uni-heidelberg.de/Englisch/helios/digi/nutzung/Welcome.html

In the meantime, I will try to find concrete example doc. (Thanks for info on form filling)

There is this section of the site - heidICON – Object and Multimedia Database of Heidelberg University (The “Virtual slide collection”) - where you are offered doc's under CC BY-SA 4.0 (there is search engine with filters in a panel on the side) :
https://heidicon.ub.uni-heidelberg.de/detail/1182141

Other sections offer doc's under same licence too.

Section with charters like these:
https://digi.ub.uni-heidelberg.de/en/sammlungen/urkunden/Welcome.html?sid=f92eeb091d38ab527a3c10780823fa73&tree_cmd=x_07e3f822935ee4ac

are all under Public Domain licence, though.

I can see one that's CC-BY-SA 4.0 so I'll create a patch but I'd like to hear from @Urbanecm before SWAT

Change 596398 had a related patch set uploaded (by RhinosF1; owner: RhinosF1):
[operations/mediawiki-config@master] Add 2 sites to copy upload domains

https://gerrit.wikimedia.org/r/596398

In T252600#6136219, @RhinosF1 wrote:

I can see one that's CC-BY-SA 4.0 so I'll create a patch but I'd like to hear from @Urbanecm before SWAT

LGTM :)

Scheduled for swat-2020-05-14-evening

Change 596398 merged by jenkins-bot:
[operations/mediawiki-config@master] Add 2 sites to copy upload domains

https://gerrit.wikimedia.org/r/596398

Mentioned in SAL (#wikimedia-operations) [2020-05-14T23:09:55Z] <catrope@deploy1001> Synchronized wmf-config/InitialiseSettings.php: Add *.ub.uni-heidelberg.de and hq.eso.org to $wgCopyUploadDomains (T252600, T252726) (duration: 01m 07s)