Proprietary Red Blend The term ‘proprietary’ means nothing in terms of legal implications. The name will generally be found on a wine that doesn’t declare the exact blend or proportion of grapes. Essentially, you can liken this term to ‘Bordeaux-blend’, or ‘Port-blend’. In the USA some producers list their wines using the term ‘Meritage’, denoting the fact that they are members of the Meritage Association.
Joseph Phelps Insignia is an example of a proprietary blend; this Cabernet-based wine does not state the names of the grapes on the label and therefore creates a terminology within itself.