Privacy Shield, the new international framework allowing companies to transfer customer data between the EU and the U.S., is getting good reviews so far, but some companies aren’t betting on it for the long term.

Companies using Privacy Shield worry that it may face the same fate as its long-used predecessor, the Safe Harbor Framework, which was overturned by the European Court of Justice in October 2015 after revelations of mass surveillance by the U.S National Security Agency. 

Digital Rights Ireland and French civil liberties group La Quadrature du Net have also challenged Privacy Shield in court, saying the new framework doesn’t adequately protect Europeans’ privacy.

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