Of course some ... block any downloading.
You have to leave the beaten path Mick.
Those sites usually disable the {right click/save image} feature of Internet Explorer, Netscape and often even Firefox browsers, but you can still harvest those resources by using a "less than mainstream" browser such as Opera. Few, if any, web designers bother with such relatively obscure products. You can download a free copy of Opera by clicking
HERE.
BTW, the Opera Mobile browser, as far as I know, is the only browser for Pocket PC's and cell phones that can read the newest format of CasCity. The mobile version of Internet Explorer just shows black screens with a few graphics when accessing CasCity.