+ Every clause in GPL was designed to uphold one of these freedoms.
+ Or, it's a compromise of drafting in adoption vs. freedom debate.
# 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.
+ Specific implementation: GPL
+ Specific implementation: GPL.
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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