Copyright protects expression, not ideas: substantial copying and colourable imitation were not proved on comparison of the two works as wholes.

Copyright protects the expression of a work, including its form, arrangement, incidents and treatment, but not the underlying idea, theme or common subject matter. Applying the tests of substantial taking, colourable imitation and overall impression, the Court compared the film and the play as wholes rather than by isolating individual similarities. It found material differences in plot, characterisation, treatment, climaxes and social themes, and held that the similarities were attributable to the shared idea and were only trivial or incidental. The Court stated that piracy must be proved by clear and cogent evidence, and concluded that the film did not reproduce a substantial and material part of the play.

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Issues: Whether the film 'New Delhi' infringed the copyright in the stage play 'Hum Hindustani' by amounting to a substantial or material copy of the protected expression rather than a permissible use of the common idea or theme.

Analysis: Copyright protection was held to extend to the expression of thought, form, arrangement, incidents and treatment, but not to the underlying idea, subject, theme or common provincialism as such. The Court applied the established tests of substantial taking, colourable imitation, the overall impression on the spectator, and comparison of the two works as a whole rather than by dissecting isolated similarities. On that comparison, the film was found to contain major differences in plot, treatment, climaxes, characterisation and social themes, and the similarities relied upon were held to be explainable by the common idea and to be trivial or incidental. The Court also held that proof of piracy must be clear and cogent, and that the film did not reproduce a substantial and material part of the play.

Conclusion: The film did not infringe the copyright in the play, and the claim of colourable imitation failed.

Ratio Decidendi: Copyright does not protect a mere idea or theme, and infringement is established only where the defendant has taken a substantial and material part of the protected expression so that the later work, viewed as a whole, gives the ordinary observer the unmistakable impression of a copy.

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