"Licensed and regulated" is printed in the footer of almost every casino, and it is the phrase players are told to look for. It is also the phrase that hides the most. A licence is a business permission issued by a jurisdiction, and jurisdictions differ enormously in what they demand before issuing one and in what they will do for you afterwards. The useful question is never whether a casino has a licence. It is which one, and what that regulator does when a player complains.
A gambling licence is permission to operate, granted by a jurisdiction, usually in exchange for fees, some form of company vetting, and an agreement to follow that jurisdiction rules. It is not a guarantee that you will be paid, not a certificate that the games are fair, and not insurance on your balance.
What it can give you is somewhere to escalate. A regulator with a working complaints process is a third party that can compel an operator to answer, and in some jurisdictions to pay. A regulator without one has issued a certificate and nothing more.
That distinction is the most useful thing on this page, and it cuts across every licence below: does the regulator adjudicate player disputes, or does it only collect fees?
These are the licences you will actually encounter, in rough order of how much they demand from an operator.
A footer badge is an image. It proves nothing on its own, because anyone can host a picture. The licence number is what matters, and every serious regulator publishes a public register you can search.
Take the number from the footer, find the regulator register, and confirm three things: that the number exists, that it is issued to the company named in the terms, and that it is current rather than lapsed. A number that resolves to a different company than the one operating the site is worth stopping over.
Every casino on this site has its licensing authority and number recorded on its review page for exactly this reason.
If a casino holds a licence with no complaints process, the escalation path is not the regulator. It is the payment provider, the software studios whose games are on the site, and public player communities — all of which operators care about considerably more than a certificate they paid for.
It is also why payout record carries more weight than licence on this site once players report it. A licence describes what an operator promised. A payout record describes what it did.