Please note that a company being listed as a Data Consumer below does NOT mean you do not need to supply ONIX data direct if you are currently doing so or have an opportunity.  The 49th Shelf and BNC CataList are the only companies that rely on BiblioShare data over getting it direct.
BiblioShare does supplies data to firms for a purpose defined by their specification -- for uses unknown really – and we cannot say if they use our data in a way that allows you to not supply it.  This would be equally true for Bowker, Ingram and other data aggregators as well. 
Data consuming businesses should tell publishers directly that they are getting their information from another source and data suppliers should not rely on any listing.  Publishers should never assume they don't have to supply data because of it's availability from third party suppliers.

Data Providers

Data Consumers