"Works in the public domain are those whose intellectual property rights have expired, have been forfeited, or are inapplicable... public domain works can be freely used for derivative works without permission." - wikipedia.org/wiki/Public_domain
"A Creative Commons license is used when an author wants to give people the right to share, use, and even build upon a work that they have created. CC provides an author flexibility (for example, they might choose to allow only non-commercial uses of their own work) and protects the people who use or redistribute an author's work, so they don’t have to worry about copyright infringement, as long as they abide by the conditions the author has specified." - wikipedia.org/wiki/Creative_Commons_licenses
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