sharepoint - Word and Custom Content Types -

I defined a new content type (document) for SharePoint. I have the problem that this word is automatically window Allows to update these properties with (for example effective date) that is not valid and I do not want to show this when the user is uploading changes (I fill some of these fields in the Eventreceiver class update method On) Or it is to customize it is possible to disable or at least write behavior?

You can create your own document information panel:.

Another option might be to set the ShowInNewForm / ShowInEditForm property of SPField but I'm not sure if the word uses them.