How It Works
Sourced Profile Photo
A profile picture used only when its license and source are verified and shown on the page. The credit links to the exact file or license page, not to a generic homepage, so anyone can check the terms themselves.
Origin
Safe licenses include CC0 (a public-domain dedication, attribution optional but given here), CC BY (reuse with attribution), CC BY-SA (reuse with attribution and share-alike), and works already in the public domain by law. Licenses marked NC (non-commercial), ND (no derivatives), or 'editorial use only' are not used. Wikimedia Commons, Flickr's Creative Commons filter, and verified public-domain collections are practical starting points, but the license page for each individual file must be checked rather than trusting the site name.