Christian Louboutin's red soles are a valid and enforceable trademark - High heels daily

Christian Louboutin's Red-Sole Shoe Trademark Is Valid, To A Limited Extent: Second Circuit — Los Angeles Intellectual Property Trademark Attorney Blog — September 14, 2012

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Louboutin Lands Win in Chinese Case Over Red Sole Trademark

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Court: Christian Louboutin Red Soles Trademark Invalid

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Christian Louboutin's red sole trademark could be invalid

Louboutin Lands Win in Chinese Case Over Red Sole Trademark