Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Search filters are available that enable finding articles with certain, specific types of Creative Commons (CC) licenses. For example, the following search finds articles about "cancer" that have a CC-BY license.
For more information about finding articles by license, see Search by License in the PMC User Guide page.
