作者：Kimberly Bolden 4 年以前
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Public Domain refers to creative materials that are not protected by intellectual property laws such as copyright, trademark, or patent laws. Everyone can use a public domain work without getting permission, but no one can own it.
Creative commons is utilized by owners of online content to give participants permission to use their work.
The four points of fair use is:
The work must be used for:
Most of the information online is copyrighted, however educators has some liberty in using materials for educational and non-profit purposes. But there are some instances in which using materials online is prohibited. In traditional copyright, work cannot be duplicated or changed without the permission of the creator.
