Applications - (Registered User Name Visibility)
There is no generic way to hide such a name as the implementation of such a splash screen differs from app to app.

Displaying the license holder’s is usually part of the protection features of the software. Therefore you’re not likely to find an official way of hiding the name.

Hiding the name is usually something wanted by those that do not have a license and don’t want others to see that. If you’re in that category, contact the vendor to see about transferring the old license or buying (possibly at a discount) another seat or license of the software.