These are usually anti-spyware or security software applications that use various forms of deception and/or unethical means or show a history of negligent false positives to goad the end user to make a purchase.
In some cases these applications maybe downloaded with some form of unwanted software at which point the rogue application is offered to the customer as a way to remove the unwanted software.
BraveSentry is related to SpySheriff and Spware-no.
It can be installed from the BraveSentry website and has been forced onto the computer without EULA and users knownledge of installation. BraveSentry can report false detections of spyware to scare the user into purchasing the product to remove the false infections.
Evaluation warning for BraveSentry. Removal is prevented.
Detected programs that are not really on computer.
Pop-up window displaying the number of infections and asking if you want to remove them.
Warning message from the trial version after you try to remove the infections.