Store Copyrighted Documents
I would like to know whether it is a copyright violation to store copyrighted documents with ZOTERO that are in the public domain in the Internet and link to them from a citation or bibliography entry? This would be desirable in order to ensure that the document will continue to be available even if its source is not available anymore.
Storing items that you have accessed legitimately in Zotero is no copyright violation. Making them available to people who don't otherwise have access to them via a private group may be a violation of the terms by which you did access them, though (albeit one that's unlikely to cause you any problems).