As I said, you could use a text content control and set it's properties to 'cannot be deleted' and 'cannot be edited'. Someone would have to be quite deliberate about messing with it to change anything. Another option would be to programmatically add the document to the document via a Document Variable. Such content is easily displayed by inserting a DOCVARIABLE field referencing the variable, but can only be changed programmatically. The downside is that you can't insert formatted content into a Document Variable.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]