In the past, they encouraged an honour system through the use of WDRP emails. In addition, they only acted or required registrars to act when an issue was reported or noticed. I guess you could call this passive enforcement.

Now, what they're requiring is that contact details are validated and verified upon first use and subsequent changes. This would be active enforcement, and was requested by the LEAs.

The practical difference that when you register a domain name, the registrar will attempt to make sure that your address is valid, that the email address you provide actually accepts email and you answer it, and check that the phone number you provide is valid.

I'm fully aware of the impact of all this. Even if wasn't personally affected by it, given I own domain names, I had to implement this stuff on the technical end, and make sure that in enabling it, we wouldn't end up scheduling thousands of our customers' domains for deletion. From a purely selfish point of view, I'm all too familiar of what the impact of the change from passive to active enforcement means.