author: Niklas Luhmann  Jürgen Habermas 

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copyrighted in countries with 50 years pma.

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copyrighted in countries with 45 years pma or shorter.

copyrighted in countries with 85 years pma or shorter.

copyrighted in countries with longer than 15 years pma.

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copyrighted in countries with 80 years pma or shorter.

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copyrighted in countries with longer than 70 years pma.

copyrighted in State of Palestine.

copyrighted in countries which use the rule of the shorter term.

copyrighted in countries with 25 years pma or shorter.

copyrighted in Somalia.

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copyrighted in countries with 100 years pma or shorter.

copyrighted in Tunisia.

copyrighted in countries with 70 years pma.

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copyrighted in countries where faithful reproduction of a 2D work of art do not have additional copyrights.

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