How to prevent a .pdf with filled fields from being saved by end users

For many years I have created interactive/fillable forms using LiveCycle Designer. Due to a recent computer upgrade beyond my control I no longer have access to this software. I have attempted to create a series of simple fillable forms using Acrobat DC which has limited capability by comparison. In the past, by default, these forms could be opened,  filled and printed in Reader but not saved with the entered information unless they were created with Reader extended rights.  Reader DC no longer seems to restrict saving and after many hours of searching I can't find a way to prevent end users from saving the entered information on personal devices which is required by law in this case. Any suggestions would be greatly appreciated.