# Using Copyright

+ GPL is primarily a copyright license.

+ Software is copyrighted.

+ License grants key freedoms.

+ Requirement prohibit activities that take away freedoms.

+ General concept: copyleft.

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> an original works of authorship fixed in any tangible medium of expression …  from which they can be perceived, reproduced, or otherwise communicated, either directly or with the aid of a machine or device

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 — 17 USC \S~102

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