I am not an attorney and nothing I post is intended to be, nor should be construed as legal advice. If you legal questions, consult a lawyer with expertise in your area and is familiar with the area of law you are wanting advice about.
In addition, U. S. Copyright law is what I research. It may or may not apply to other countries. In the case of public domain and something being also covered by copyright at the same time, it happens. Ancestry is a great example as they have collections. While some of the collections include public domain items, the fact Ancestry includes them in a collection means the public domain items are covered by the collection Ancestry created. This means all of any collection is protected by Ancestry’s copyright.
I saw this today on Newspapers.com, specifically the Publisher Extra version: Discover your ancestors in the news with FREE ACCESS* to Publisher Extra through February 15th: https://go.newspapers.com/freeaccess. Starts today. Don’t believe it applies to the basic Newspapers.com subscription. I don’t recommend attaching the articles to any genealogy website as the items are covered under Ancestry‘s Terms and Conditions and are covered by copyright. That include articles that are otherwise in the public domain. As Ancestry has made this a collection, copyright applies.
Clip articles when found!
Don’t assume you’ll be able to find the article later. Clip any article you find that might be relevant to your research and make a brief annotation so that you use the search in clippings to easily find who you were researching.
Check spelling variations.
Research siblings and cousins.
Research places of business.
Military units are often discussed.
*Access to Publisher Extra papers on Newspapers.com™ will be free until 15 February 2021 at 11:59 p.m. MT. After the free access period ends, you will only be able to view Publisher Extra papers using a Newspapers.com Publisher Extra subscription. Terms and Conditions apply.https://go.newspapers.com/freeaccess