Third-party content is content created/produced by an individual or organization that is not the website owner. Some websites allow third parties to upload content onto their websites, like blogs, articles, or videos.
Does the content (or page) belong to the website?
Consider the following steps to verify the content/webpage ownership:
PubMed.gov is a website from the National Library of Medicine comprised of citations and full-text articles. It often contains third-party content. It will post a free article designation or copyright information near the top of the page, or it will provide a link to the content, which usually involves leaving the PubMed website.
If a third party has uploaded the content and you cannot determine the copyright restrictions (i.e., there is no Creative Commons license or copyright language posted on the content), the next step is to locate the third-party's website and its restrictions.