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Section 32: Protection of registration on ground of distinctiveness in certain cases
Where a trade mark is registered in breach of sub-section (1) of section 9, it shall not be declared invalid if, in consequence of the use which has been made of it, it has after registration and before commencement of any legal proceedings challenging the validity of such registration, acquired a distinctive character in relation to the goods or services for which it is registered.
Source: official text of The Trade Marks Act, 1999 as published on India Code (PDF). All sections of the Trade Marks Act, 1999.