When Does a Public Data Good Become a Private Data Resource? — Dennis D. McDonald's Web Site

"Today we see government policy and programs to make government data publicly accessible under constant development, as demonstrated by the activities covered at last week’s Data Transparency 2013 conference. We are seeing many opportunities for government agencies to provide data online 'for free' to Internet users. Opportunities also exist where that same information can be 'republished' online either in its original form, transformed somehow, or 'mashed up' with data from other sources. Sometimes these additional sources are 'free.' At other times they might exist behind a paywall."