US Copyright Act
506(c): "Fraudulent Copyright Notice. — Any person who, with fraudulent intent, places on any article a notice of copyright or words of the same purport that such person knows to be false, or who, with fraudulent intent, publicly distributes or imports for public distribution any article bearing such notice or words that such person knows to be false, shall be fined not more than $2,500."
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There already are legal/monetary repurcusions (as Greg Grossmeier)
US Copyright Act
506(c): "Fraudulent Copyright Notice. — Any person who, with fraudulent intent, places on any article a notice of copyright or words of the same purport that such person knows to be false, or who, with fraudulent intent, publicly distributes or imports for public distribution any article bearing such notice or words that such person knows to be false, shall be fined not more than $2,500."
From: http://www.copyright.gov/title17/92chap5.html
CC0 isn't a license... (as Greg)
it is a waiver. Just saying.
It should say "its CC0 waiver"