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Flickr Public Domain Search – About 6 million Public Domain images (link is to search filtered by "CC0", "No known copyright restrictions" and "U.S. Gov't Works"). Includes British Library. Free-Images.com – More than 12 Million Public Domain/CC0 stock images, clip-art, historical photos and more. Excellent Search Results.
Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."
JPEG XL – an image format designed to outperform and replace existing formats. Especially legacy JPEG. Supports both lossy and lossless compression. MNG – moving pictures, based on PNG; OpenEXR – a high dynamic range imaging image file format, released as an open standard along with a set of software tools created by Industrial Light and ...
This logo image consists only of simple geometric shapes or text. It does not meet the threshold of originality needed for copyright protection, and is therefore in the public domain. Although it is free of copyright restrictions, this image may still be subject to other restrictions.
Images only qualify as being in the public domain if they fall under certain specific categories described below – images ineligible for copyright protection, very old works, works by certain government employees, and works where an explicit disclaimer of copyright has been made in writing by the author.
{{PD-Philippines}}: for works whose copyrights have already expired, that have been released into the public domain, or that are ineligible for copyright as stated by Philippine copyright law. {{PD-PhilippinesPubDoc}}: for official public documents (or portions thereof) made in the Philippines of a legislative, administrative or judicial nature.
Free files can be moved to the Wikimedia Commons. This category is not shown on its member pages unless the appropriate user preference (appearance → show hidden categories) is set. Media in category "Public domain images ineligible for copyright (shape)"
Though the search engines may be accessed for free, indexed images themselves may be under restricted license. Google Books [3] - Searchable archive of magazines and books (some full-text, including photograph captions and references to photographs from related articles and content).