Broker's licence
The operation of a brokerage company involves many minor acts anchored in legislation. From the operation of the broker as a firm with employees; arranging the opening of client accounts to handling client deposits and managing the online platform through which clients trade. For all of this, a broker needs a license. While this can be issued by almost any state authority, licences of some states are more desirable than that of others. And that is due to variety of reasons.
Licenses issued in so-called offshore states allow brokers to provide their clients with very attractive trading conditions. For example, the financial leverage that allows a client to multiply his or her trading position and with it also potential earnings (as well as losses) can often go as high as 1:1000 for offshore licenses. However, when it comes to client protection, offshore licenses fall somewhat short.
Client protection takes many forms and one of them is the wording of the mentioned disclaimer. Thus, if you see a disclaimer below the image of an advertisement that does not state the percentage of loss but only somewhat vaguely warns of the potential risk, it is very likely that the broker to whom the advertisement belongs has an offshore license.

Image: Purple Trading banner ad (see disclaimer below the button)