Anyone who has visited your website has downloaded the images you have on there, which will be stored in a temporary location on their computer for a while.
An excellent point Phil! Isn't permission for this "download"
implicit in it being on a publicly available website though? If I put a picture on my website, it is clearly my intention that people should view it. To view it, it
must be copied to their machine in some form (whether it goes into cache or not), therefore I have effectively given permission for the download. What I have
not given permission for however, is for it to be used in any other context. The fact that I have permitted anyone to download it for viewing does not imply that they can for example, use it on their own web site.
shutter - I'm sure you'd be pretty annoyed, and rightly so, if one of your red-arrows pictures appeared on a commercial poster for an air-show or something? It's your picture, you didn't give permission for its use, so it's a breach of copyright.
The situation with music is similar - if I make a CD and someone buys it, or I make it available for download, I'm effectively permitting them to use it for their own listening pleasure. In exchange for a fee, I'm allowing them certain priveleges. What I am not doing is saying it's okay for them to do whatever they like with it. You can debate the pros and cons of whether or not this is a good thing, but as the law stands, when I create a piece of music, I own the copyright, and I alone have the right to decide what I want other people to do with it. If I decide to give it away, i can do that, but likewise I can decide that I want to charge for every use of it, and my right to do that is protected by the law.
Barry - iTunes is an excellent example of "an affordable, legal download system", but even though the tracks are very cheap, people still download these tunes and give them away to their friends, and/or convert them to other formats for P2P sharing. Lowering the cost no doubt helps, but goes nowhere near to eradicating the P2P wholesale theft of other peoples property. In iTunes and other download systems, thankfully a relatively high proportion of the money goes to the artist. But this begs the question, how can costs be further reduced (if that's what's needed to stamp out piracy) without hitting the musicians in the pocket? An awful lot of brilliant musicians cannot make a living out of their sales - if prices go lower, this will only get worse. If it does, musicians, studios, producers etc. will either say "why bother" and leave the industry, or standards will drop.
There's been a bit of chat about "rights" here, (as in, people have the right to do whatever they like with their internet connection) - P2P sharing without appropriate permission is taking away someone's "rights" to their own intellectual property. Surely we all accept that we should exercise our "rights" within the law?