All content found at this domain is protected under copyright.
Unless there exists a file with the .lic extension for the file or path under question which can provide source attribution or further licensing.

Example:
http://static-assets.hbrisk.com/items/item.pdf      (source file)
http://static-assets.hbrisk.com/items/item.pdf.lic (license file)

Or
http://static-assets.hbrisk.com/items/item1.pdf   (source file)
http://static-assets.hbrisk.com/items/item2.pdf   (source file)
http://static-assets.hbrisk.com/items/.lic             (license file)