What's the etiquette rule?

[smweaver]

Kind of funny that when I was recently on Norman's Orchids website (orchids, gift orchids, hobby growing) I was surprised to find that they snagged my picture of my large Dendrobium speciosum to use:

Den. speciosum var. pedunculatum ( x )

I guess it's not that big of a deal--and I'm kind of flattered in a way--but I would think that surely there's some sort of etiquette rule that's been breached when anyone (commercial grower in this case) uses someone else's photograph and doesn't give credit for it. Maybe I should send them a nice email and ask if the plant that's featured is theirs just to see what kind of reply I get. :-)