The internet search engine Google is resisting efforts by the US Department of Justice to force it to hand over data about what people are looking for.
Google was asked for information on the types of query submitted over a week, and the websites included in its index.
The department wants the data to try to show in court it has the right approach in enforcing an online pornography law.
It says the order will not violate personal privacy, but Google says it is too broad and threatens trade secrets.
Privacy groups say any sample could reveal the identities of Google users indirectly. And they say the demand is a worrying precedent, because the government also wants to make more use of internet data for fighting crime and terrorism.
However, the Department of Justice has said that several of Google's main competitors have already complied.
