The highest court in the EU has ruled against a major data sharing deal with the US.
In a nutshell, it means the personal details of Irish people will no longer be allowed to be shared with America's National Security Agency.
The ruling comes following a case taken by an Austrian student against Facebook in Dublin.
Max Schrems said the transfer of personal data to the US where it can be monitored, is against EU law.
The issue revolved around what's known as the Safe Harbour agreement. It's a way for any transatlantic company to abide by rules on storing user information, so that it is kept safe.
The EU believed the agreement offered a good level of protection, but that was before Edward Snowden's revelations about the NSA. It emerged intelligence agents were routinely monitoring people's everyday communications.
This European ruling means that many companies will have to keep their European user data stored in Europe rather than the US. That arrangement offers a much higher level of privacy and protection for users in, say, Ireland.
The European Court of Justice says Ireland's Data Protection Commissioner now has a duty to re-examine Max Scrhrems' claims against Facebook. The commissioner will have find to out what information was being transferred to the US under Safe Harbour.
