A European regulatory authority has reportedly told Google (NASDAQ: GOOG) that the company must make major changes to its privacy policy.

France's data protection regulatory agency, the National Commission for Computing and Civil Liberties (CNIL), is expected to hold a press conference Tuesday to reveal its findings. Bloomberg News says it has obtained a letter the EU sent to Google criticizing the search giant's collection of personal data about Internet users.

The Guardian is reporting that EU authorities have determined Google changes implemented earlier this year violate EU law. The CNIL in February stated concern about Google's combination of data across services. "By merging the privacy policies of its services, Google makes it impossible to understand which purposes, personal data, recipients or access rights are relevant to the use of a specific service," wrote the CNIL in February.