America, Britain and all the countries of the European Union have adopted and implemented ideas from (mainly) the United States, in that many governments the world over are increasingly aware of security threats developing in the form of radical political movements and their terrorist activities which are threatening key assets, critical to their security and effective functioning.
The Americans call it "Critical Infrastructure Protection" (CIP), whilst the European Union calls it the European Programme for Critical Infrastructure Protection (EPCIP).
Such critical installations should include, but are not limited to:
A country's law making bodies (the legislature and courts), military installations, prisons, financial institutions, oil production, electricity generation, transportation, telecommunications, water, health, official residences of heads of state (e.g. the White House, Buckingham Palace) etc.
As I said earlier, "critical infrastructure" is the operative term here and it seems to be internationally recognised, nowadays. The DA is trying to create the impression that they invented the idea, but they actually stole the name from other countries, ignoring the fact that South Africa has had it since 1980, in the form of the National Key Points Act. It is most definitely not a new concept; it just has a different name.
South Africa was way ahead of its time when the National Key Points Act was enacted, but certain aspects of the act need tweaking or revision. The act primarily made provision for the recognition of the need for the protection of various key points within South Africa. Arguing the need for such policy is not an endorsement of the apartheid era system, but merely taking lessons learnt and applying them to modern day South Africa. By the same token, many horrible technologies of World War II were key in the technological advancements we enjoy today.