Yahoo faced reports that it had created code to search email content for signatures associated with state-sponsored terrorist activity. Yahoo responded cautiously, saying, “Yahoo is a law abiding company, and complies with the laws of the United States” Privacy, it turns out, is a high-risk issue in todays information economy. Yahoo fought the case under the veil of secrecy that shrouds the FISA courts, which makes it difficult for companies to comply with requests for data requests.”]
Source: https://www.csoonline.com/article/3129405/the-privacy-perils-of-rocks-and-hard-places.html