If the only edits allowed in the form are the ones you specify, you could use formfields in conjunction with 'filling in forms' protection. See:
http://www.quepublishing.com/article...27853&seqNum=8
Alternatively, if the forms users are all using Word 2007 & later on PCs only, you could use content controls. See:
https://support.office.com/en-us/art...C-542F732C8C8B