Portugal Bans Use of DRM to Limit Access to Public Domain Works
eff.org
eff.org
This has had many effects, but this bill in particular was introduced by the Left-Bloc, and then voted favorably by all the left (and by the single representative of the party "People, Animals and Nature", which doesn't consider itself left- or right-wing).
In Portugal? It seems to be a pretty common result in central and northern europe, it's also the result of the very recent NZ elections (the right-wing Nationals got 44.45%, Labour 36.89, NZ First 7.2% and the Greens 10.7%, NZF announced a coalition with Labour with confidence and supply from the Greens).
Sounds very similar to the approach Portugal has taken with drugs: de-criminalize the use but not the (large scale) distribution.
If the work is yours, you can use DRM.
If the work isn't yours and it's copyrighted and you know who the author is, you ask permission to use the work, and permission to apply DRM.
If the work is public domain, you don't apply DRM.
The scenario you describe is works for which you don't know the copyright status. Your choice is to either go ahead and use the work without DRM, or apply DRM and potentially face consequences.
In this last case, the case you seem so concerned about, what purpose would DRM serve? It isn't your work, you should not care if anyone copies it.