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How much of someone else's copyrighted material can I legally use in my own work without violating copyright law?

There is no specific percentage of a work that can be used without infringing on copyright, and the "30% rule" is an internet myth.

Fair use is determined by four factors: the purpose and character of the use, the nature of the copyrighted work, the amount and portion used, and the effect on the potential market for the copyrighted work.

The purpose and character of the use are the most important factors in determining whether a use is fair, and courts consider whether the use is transformative, adding something new to the original work.

Fair use is not an automatic exemption, and a nuanced analysis must be done for each intended use of copyrighted material.

There is no bright-line rule for determining what constitutes fair use, and courts consider each case on its own merits.

The amount of copyrighted material used is only one factor in determining fair use, and even small portions can be considered infringing if they are significant to the original work.

Fair use is not limited to educational or non-commercial uses, but any use that adds value to the original work can be considered transformative.

Courts consider the market effect of the use on the original work, including whether it replaces the original or expands its reach.

Fair use is not a one-time determination, and courts can re-examine the use if new circumstances arise.

The US Copyright Office provides guidance on fair use, but ultimately, it is up to the courts to determine what constitutes fair use.

Fair use is specific to US copyright law, and laws vary internationally, making it essential to consider local regulations when using copyrighted material.

Fair use is not a substitute for obtaining permission from the copyright holder, and it's always best to request permission whenever possible.

The nature of the copyrighted work also plays a crucial role in determining fair use, with more creative works (e.g., fiction, music) receiving more protection than factual works (e.g., news, research).

Courts consider whether the use is genuinely transformative, adding new insights, or merely substituting the original work without adding value.

Fair use is not limited to verbatim copying; even paraphrasing or using similar ideas can be considered infringing if they are too similar to the original work.

The US Copyright Office provides resources to help determine fair use, including the "Fair Use Index" and "Fair Use Evaluator" tools.

Fair use is not only applicable to literary works but also to music, images, and other types of copyrighted material.

Courts consider the legal and social implications of the use, including whether it promotes the public interest or undermines the original creator's rights.

Fair use is not a absolute exemption, and copyright holders can still take legal action if they believe their rights have been infringed.

Determining fair use often requires professional guidance, and it's recommended to consult with a legal expert or copyright specialist when unsure about using copyrighted material.

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