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The term “copyright system” encompasses three levels of material: theory (the arguments, drawn primarily from economics, political theory, and philosophy, concerning why and how the law should regulate uses of expressive materials); doctrine (the rules currently in force concerning uses of expressive materials and the ways in which those rules are typically interpreted and applied); and practice (how those rules affect various fields of art, industry, and culture—literature, music, film, photography, journalism, software design, architecture, fashion, comedy, games, and so forth).