Yes.
When a copyright expires, the work enters the public domain. In the public domain, the work is no longer protected by copyright law, and anyone is free to use, reproduce, or modify it without permission or payment.
"Public domain software" is software that has moved into the public domain. You're free to copy, display, sell, or adapt it. No one owns the copyright on that software.
Public Domain pictures are images, photographs, or pieces of art that are free from copyright regulation; this makes them public domain. Companies such as Public Domain Image and Public Domain Pictures offer access to images for free. Other great companies are USA government website, as many of their images are public domain, and PD Images.
Materials protected by copyright may only be used by their creators or rightsholders; anyone else wishing to use them must get permission. Materials in the public domain are available for free use for everyone.
Images in the public domain, such as NASA imagery, would be copyright-free. People often use "copyright-free" to describe the millions of images on Flickr that carry Creative Commons licenses, but this is technically incorrect. The images are still protected by copyright, they simply have extraordinarily broad licenses that allow many uses without further permission.
Public domain software is generally made available at no cost.
To find copyright-free information on Google, you can include "public domain" or "creative commons" in your search query. Alternatively, you can visit websites like Creative Commons or Wikimedia Commons that offer copyright-free content. Always verify the specific usage rights associated with the content you find.
There is a great deal of public domain sheet music available at the links below.
No; the original edition will not enter the public domain until 2032.
Yes, "The Little Engine That Could" is in the public domain as it was first published in 1930, more than 95 years ago. This means that the copyright has expired, and the story is now free for public use.
You should always look for the copyright information. If there is none then you need to contact the author or owner of the material and ask them. Never assume. Most of the time though you'll see the license. It could be public domain, creative commons, copyright free, or copyrighted, etc, etc. Check the links below for copyright free resources.
There are web sites that host royalty free images but these are still the subject of copyright. In fact, every image is copyright protected unless the owner of the copyright releases all claim to the copyright and makes the image freely available in the public domain. A search of public domain images may prove fruitful.