Public Domain pictures or anything within the public domain is content that you can freely use, and as the words indicate they belong to all mankind. But that’s just the simple, plain English description. There are certainly some other nuances of Public Domain content that you must be aware of, and it is also a great idea to attribute any Public Domain content you use.
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Microsoft and the Office logo are trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries.