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Tableau Public Premium gives you the ability to publish views to the public web. However, you are not able to control who sees what views--there are no permissioning features. Tableau Server would be a better option here--use filters or individual permissions can be set.
For more information on Tableau Public Premium: http://www.tableausoftware.com/products/public#tableau-public-premium
Given your requirements, Tableau Server sounds like the best option here. The two critical parts that make Tableau Public Premium probably not a good fit are:
1. Limited audience to only vendors
2. Live real-time data connection
Public Premium allows for you to secure the data behind a view (remove the download button - example), but the visualization is still wide open for anyone to see. There is no concept of logins or authentication for viewers so it's not a good solution for sharing proprietary or confidential data.
Public Premium also does not have a live data connect capability - in memory extracts only. The nice thing about this though is that since updating extracts in Tableau is a 3 click process, many Public Premium users find that even if their data is updating everyday, manually refreshing their extracts and republishing to their account has a minimal impact on their day.
Hope this helps. Happy to answer anymore questions.