Ransomware is a type of malicious software that encrypts your files and demands a ransom for their release, effectively locking you out of your data and systems. Windows Security Ransomware Protection prevents that from happening. You have to manually give the OK to each and every App that makes changes to protected folders (Documents). Imagine if all of the folders on your hard drive was unreadable, and some guy with a funny accent wants you to pay him 100,000 pounds before he will give you the key to decrypt your computer. This is becoming a very real thing. Specially for small businesses. The fix to Open Brush is pretty easy once you understand how the anti virus works. Simply give the App you want permission to make changes to the protected folders and you are good to go.