It is not theft. It may be copyright infringement (note there are legitimate uses for images in other material where copyright may not apply, such as satire).
Copyright infringement has never been nor ever will be theft or stealing. It is purely copyright infringement.
You know what, you're right from a purely legal point of view. It is not considered theft legally (I have retracted the text in red, see below. Copyright infringement is in fact considered theft in the eyes of the Federal Government, even when there was no monetary gain or expectation of gain. There are severe penalties and instances of Copyright infringement can be investigated by the FBI.),
because the government does not (yet) arrest people for copyright infringement and put them in jail (But they do! So I retract this also! In fact, it is believed that criminal prosecutions for copyright infringement are on the rise and are expected to increase greatly in the relatively near future.) It is a civil matter, at this time that if the infringement can be proven willful, becomes criminal (theft).
But in practice, I personally don't understand how downloading copyrighted music (for instance) without paying for it is any different then walking into a music store and shoplifting the same music.
I believe it is more a case of the law hasn't quite caught up with the digital age. But it will.
Furthermore, it is
parody that can be covered by "fair use", not satire. Unless the satire also has elements of parody, which of course would be argued in the court. There is a relatively interesting discussion of it here...
http://apps.americanbar.org/litigation/committees/intellectual/roundtables/0506_outline.pdfSo, for my purposes as a professional photographer, use of my images for pretty much anything beyond an actual parody of my work would not be covered by fair use. Thus, copyright infringement. If deemed to be willful copyright infringement, it could be prosecuted in a Federal Criminal Court.
EDIT to add
Title 17 of the United States Code does make provisions for Criminal copyright infringement in certain circumstances...
This Title 17 Copyright law can be found here... http://www.copyright.gov/title17/92chap5.html
EDIT TO ADD MORE
Furthermore, the federal No Electronic Theft Act (NET Act) of 1997 expanded the criminal portion of copyright law to include willful infringements even when the infringer had NO gain or expected gain from the infringement.
Would like to point out the word THEFT in the name of the Act. So, it seems that willful copyright infringement is THEFT in the eyes of the Federal Government. I retract my retraction and reaffirm my opinion that copyright infringement, when proven to be willful, is in fact theft in the eyes of the law. A person convicted in a Federal Criminal Court of Criminal Copyright Infringement can receive a penalty of up to 5 years in prison and $250,000 fine per infringement. Then of course, the injured party would be able to seek a civil judgement for their losses and damages as well.
You can find the wiki on the NET Act of 1997 here...
http://en.wikipedia.org/wiki/NET_Act