This is a very good question...
The inspection report itself, since it's arranged for and purchased by the buyer should be considered the sole property of the buyer. You do not have to share it(the document) with anyone you choose not to.
On the topic of "disclosure"........sellers are bound to disclose any recently identified problems that materially effect the property....regardless of the source. (For example, a structural inspection reveals that a home is infested with termites. Once this information is out there, regardless of who paid for the inspection, the seller is obligated to make this information public.)
The problem would most likely be picked up during subsequent inspections and as long as the report itself is not shared(photos, overview, recommendations, etc.) and the seller is only sharing the general deficiency, it commonly acceptable.