The EU and U.S. competent authorities have one year to implement the recommendations that the Article 29 Working Party (WP29, which is a gathering of all EU national data protection authorities) made in its opinion of November 28, 2017 to increase the level of personal data protection provided by the Privacy Shield framework. As they announced in this opinion, failure to do so will result in these authorities challenging the validity of the Privacy Shield adequacy decision before courts. Such a cancellation could lead to certified U.S. companies losing their certification (2,400 companies, including web giants and major cloud providers), having to freeze data flows and implementing other legal mechanisms allowing them to import personal data from the EU.
It should be noted that the EU and U.S. authorities negotiated the Privacy Shield under a perspective that was more in line with Directive 95/46 (the main data protection applicable instrument at the time of negotiation) than with the General Data Protection Regulation (GDPR). The GDPR will repeal this Directive and increase the level of protection of personal data from May 25, 2018, and the WP29 will plan to prepare businesses for it.
In its report, the WP29 focuses on guarantees of enforcement and efficiency.