Forty nations have to ratify the treaty for it to enter into force, and they have some leeway on how to implement it.

Other countries seeking data sharing agreements similar to the one with the U.K. include Turkey, Japan, India and most of Europe.

Data collected by tech companies could be used to prosecute abortion seekers, they warn.

Prosecutors say Adrian Pena used Securus.

Researchers say the technology is secure, though it touches on lingering anxieties.

The issue has long been a concern for civil liberties groups and press advocates.

Privacy advocates are denouncing the ruling.

Millions of people have downloaded the app in recent weeks.

The EFF's Crocodile Hunter includes an API that gathers data on IMSI catchers and shares it with other researchers.

Researchers worry that corporations' "terms of service" could have too much sway over the implementation of a federal anti-hacking law.