Four of the UK’s major ISPs (Internet Service Providers) are working on a plan that would see customers opt-in if they want to be able to view pornographic content online. The Guardian reports that the new policy is expected to be unveiled today by Prime Minister David Cameron as part of a No. 10 meeting with the Mothers’ Union and is aimed at protecting children from the vast amount of pornography and adult material online.

While there has been some confusion over how the system will work, ISPs that spoke to the Guardian newspaper said that only customers signing a completely new contract will be asked to choose between a connection with these new parental controls, or one without. Current customers, as well as those who change tiers but stay within the same service will not be asked to choose. TalkTalk described it as more of an active-choice rather than opt-in. How each ISP will implement the new measures differs, too. While BT and Sky offer McAfee software that’s downloaded to your machine, Wired UK reports that TalkTalk and Virgin’s blocks are both network-based.

Though it may seem like an extreme solution, it’s also important to note that the blocking and/or filtering features to be provided by BT, Sky, TalkTalk and Virgin are nothing new. These products were added to each of the ISPs portfolios a while ago. However, now, your ISP will be asking you whether you want it when you sign up.

“The ISPs have committed to improve the way they communicate to customers, enabling parents to make simple and well-informed choices about installing and activating parental controls and other measures to protect children online,” the four companies said in a statement. “The four ISPs are working with parents’ groups and children’s charities on this important initiative and will continue to do so.”

There will also be a website called ‘ParentPort’ where parents can go to complain about inappropriate content such as TV shows, advertisements or services. Read more on the Guardian.