I have no idea at all what you're talking about, I've rented cars several times for my work trips and I've never needed anything like that, just my driver's license and my credit card. I've tried googling and I can't find anything, and I visited that easyrentcars.com and I've looked at their website, and I'm still totally confused, it says all you need is your driver's license, your credit card, and your passport or something if you're visiting from another country. Have you ever really encountered this before when you're renting car? Are you sure it wasn't from like a weird company or something? I'm so sorry, I'm just really confused and I'm trying my best to figure things out.
Oh and if you use your VISA Signature card, you get free insurance for your car rentals, as long as you use your card for both your reservation and your charge, and you decline car insurance you're offered from them