Open to all registrants CrossMark was launched by CrossRef in 2012 and allows scholars to easily identify documents that are being actively maintained by their publishers. The appearance of a CrossMark logo on an HTML or PDF document indicates that the publisher is taking care of or stewarding it through any updates, corrections, enhancements, retractions, or other changes. Clicking on a CrossMark logo may also provide important publication record information about the document, which might include peer review, publication history, funding sources, location and links to data sources, CrossCheck plagiarism screening or copyright and licensing information. Learn more at http://www.crossref.org/crossmark/index.html.