Occurs when a project has been saved with strip credentials attribute set to true This event gives the opportunity to strip credentials from anything that the subscriber may be persisting in the project. It's important to note that the projectID that is passed is not the projectID of the currently open project. It is the projectID of the project that is being opened in the background specifically for the purpose of stripping credentials.

public sealed class ProProjectSavingStripCredentialsEvent : ArcGIS.Core.Events.CompositePresentationEvent<ProProjectStripCredentialsEventArgs> 

Public NotInheritable Class ProProjectSavingStripCredentialsEvent 
   Inherits ArcGIS.Core.Events.CompositePresentationEvent(Of ProProjectStripCredentialsEventArgs)