FWIW - here in the UK any use of a drone or model aeroplane by or in support of a commercial operation (ie the usual "for hire or reward" thing) requires a form of Air Operator Certificate from the CAA.
But...
These AOCs are neither difficult nor expensive to obtain. The principle requirement is an agreed ops manual which defines the scope of operation and the procedures for ensuring minimal risk to third parties (distances within which other people must be informed etc). I have assisted three organisations in getting their certificates - one wildlife photographer, one specialist roofing contractor and one estate agent. Each was less than an hour's work.
PDR