u can use some of the softwares to do so and make ur pics or file anti copying.
available on the sites
http://www.filebuzz.com/files/file_copy_html/1.html
http://www.phazeddl.com/search.php?q=file+anti+copy - available for free on this site anme of program is “file anti copy”
or
http://www.artistscope.com/copysafe/copysafe.html
there are may others just serach for them

this can also protect ur site from data theft but still its a not promises to full security of ur data. a theif can always find some way to enter ur hose

for more refrence u must visit this site it tells about various things and also gives java script to disable right click to unable copying and it also tells about the copyrights u must know http://www.brownielocks.com/stopcopying.html

hope this is useful

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