You'll need to be a Symantec Partner to get access to DLP Not for resale license that lasts 12 months.
You can find it at this URL
https://partnernet.symantec.com/Partnernet/Product/Product.jsp?solutionID=1&catID=17&productID=933&useID=5&typeID=100000352
I'm not sure if DLP 11 has been released to the public yet though...if you're look for the Beta Test then you're too late 'cause it should be released this month.
Hope that helps
~xlloyd.