Hi! The Spanish Wikisource community recently approved certain changes in that wiki (https://es.wikisource.org/wiki/Wikisource:Votaciones/2018/PDE). One of the changes implies to enable the local uploads. The local uploads are pretended to be only for a few cases (those files not uploadable to Commons yet for not being in PD there yet, but in the future). Since 2014 it is only allowed to sysops. Now we request to allow all loged-in users to upload files localy as well. Thanks!
I don't see an EDP either.
Also, this raises an interesting question about which copyright laws apply to a Spanish language project - the USA one or some kind of "average Spanish language country" one? In theory it'd be the former but I know that the German language Wikipedia assumes that it's the latter scenario (OK, "average German language country").
Sorry for the delay in answering.
The EDP is in fact what we recently voted (see the link to es.wikisource in the first message). The updated copyright policy is https://es.wikisource.org/wiki/Wikisource:Derechos_de_autor
There is no link to that Wikidata item, because there is no specific page to that in es.wikisource. I already noticed, when preparing the voting, that no Wikisource has a link to that Wikidata item: https://es.wikisource.org/wiki/Wikisource:Votaciones/2018/PDE#cite_ref-2 , but a de facto EDP applies to French, German, and other Wikisources -you can look at the links in the reference I've linked-.
The es.wikisource policy is quite similar to French Wikisource's one, because (1) we allow pre-1923 works whatever the PD applies or not to the "Spanish language country"'s law, and (2) we now allow works that are in PD in the "Spanish language country" (excluding USA) but it was not in PD there at URAA date (so now in 2018 that work is copyrighted in USA, and that's why uploading to Commons would not be OK). The uploaded files should be minimal.
Please, guide me/us for the next steps: is the specific EDP, Wikidata linked, page mandatory?... Best regards!