What is ~/.java/.userPrefs/JetBrains directory used for?

Question

There is a .java/.userPrefs/JetBrains directory under the user's home directory. What is it for?

For example, ~/.java/.userPrefs/JetBrains/'_!(!!cg"p! ...etc ... :!e@=='/prefs.xml

Answer

It was used for evaluation license for previous versions of JetBrains IDEs. It's not needed anymore.