Software propagation

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Software propagation is a general term for the copying & duplication of software, and was explicitly defined in version 3 of the GNU General Public License. The term is deliberately intended to distinguish between the activities permitted by free software licenses and those that are forbidden by various systems of copyright.

[edit] Defined by GNU GPL v3

To "propagate" a work means to do anything with it that, without permission, would make you directly or secondarily liable for infringement under applicable copyright law, except executing it on a computer or modifying a private copy. Propagation includes copying, distribution (with or without modification), making available to the public, and in some countries other activities as well.