There are URLs on WU that return raw weather station data (i.e., not HTML formatted) without specifying an API key. Is using data from these URLs 'fair game' if the WU logos and links are displayed on a website that uses this data?
Any of these remaining URLs will be going away. They are unsupported and subject to be taken down without notice. They will be placed into the API so the data will still be available, and at that time the original raw URLs will cease to work.