Hi everybody! 
I’ve been using iD to contribute to both OSM and OHM for quite some time, but I only recently realized that the first and second edition OS maps are available as backgrounds when editing Ireland in JOSM. Is it for purely technical reasons that they’re not also available by default in iD, or are there non-trivial usage restrictions that prevent their inclusion there? (I’m guessing the former given that the source material’s out of copyright, but I just want to make sure…)
Also, are newer editions all still under copyright, or are some of them in the public doman and it’s just that there aren’t any freely-available scans of them?
Thank you! 
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My understanding is that it was a decision by the iD maintainers.
There is no issue with using Out of Copyright maps to contribute to
OSM.
I think it comes down to a faster pace of change in other parts of the
world and not having 100+ year old detailed maps that we have in
Britain and Ireland.
So carry on using them in josm.
Cheers Phil
The iD build process simply filters out any sources (ftom the editor-layer-index) that are not reasonably (fsvo) recent. You need to check but I’m fairly sure that’s what is happening here.
PS: @trigpoint -180 year old detailed maps Maps of Switzerland - Swiss Confederation - map.geo.admin.ch
Thanks guys, that makes sense!
In fact, it looks like JOSM isn’t getting them from editor-layer-index, but from the JOSM wiki. Maybe the fact that it’s a separate one for each county makes it too cumbersome to add to the index, especially when it’s mostly of use for historical mapping…
But I guess there’s no reason I can’t fill those sources into the “custom” field in iD and use them (I find JOSM cumbersome when I’m so used to iD 
).
EDIT: Looks like the “custom” field is broken on OHM’s iD, go fig… 
(On the other hand, the cutoff is indeed the reason that the Bartholomew, GSGS 4136 and Memorial Atlas layers aren’t included in iD – at least in OSM iD, not sure what’s going on with OHM…)