Sorry mate ,only just seen this.
I have done lots of commissioned work, mainly for country estates and industries over here. It is a very difficult market to get into as the people are very wary and tend to use people they trust. Since our economy went pear shaped, it is more to do with who you know now rather than what you know.
Unauthorised use? An example for you, some business in the UK decides they like one of my shots, they nick iot off the web and use it to promote themselves via advertising, if I spot it, then I send them an unauthorised use invoice. because the theiving gits didn`t buy it, they stole it. Basically, anything you post on the net can be stolen, the hard part is finding if they are being used commercially.
The earlier shot of the peregrines won we a good prize and sold for a good sum of money.But shots like that are not everyday type shots.