Publish Subscribe with Ack

In a past project, we had implemented a "new EAI pattern" - Publish Subscribe with acknowledgement. How this was different from the regular Publish Subscribe was that all the subscribers would acknowledge the receipt of the message to the publisher, adding another layer to "guaranteed" delivery - a cross between Request Reply and Publish Subscribe patterns. The usage scenario was, while sending master data from a Source of Record to all subscribing systems, the receipt of the data was to be ensured as it was functionally critical.

I am not too convinced that this is indeed a new pattern as publishers in the Publish Subscribe pattern, need not be aware of the subscribers. But in this case they would have to be.