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All Forums > Tech Talk > Tech Talk Forum Page 59 > Protected image files on websites
AuthorPost
Tinaka
Member


953 Posts
8/03
Posted - Mar 18 2004 : 2:11PM
The other day i was on a website and i tried saving some of the pictures. They were appearently not to be downloaded as right clicking was disabled. I did save them as this is not a problem in IE6. However when i went to open the files i had just saved, only one pixel was actually saved. Im not asking how to get around this because i did eventually, just: How did they protect them in that way? Does this mean when you go to save a file, you could actaully be downloading a different file and not know it?

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Drew Black
broken crankshaft

8009 Posts
9/99
Posted - Mar 28 2004 : 10:54AM
There's a number of ways to do this on the server end. Which method depends on the type of web+server being used. It's very easy with Apache using an add-on module called mod_rewrite (I think, I'm not an Apache guy.) On Microsoft servers you can write a custom ISAPI filter or specify a different script engine/handler be used for .JPGs or any other file types. Accomplishing this on a .NET enabled server is much easier than the older IIS platforms.

There's a number of different things that these programs could be looking for in a request to determine if it's a legitimate access. Most commonly they use cookies or referrer strings. In some elaborate systems they use server-side session data. If the server determines that the request is invalid for whatever reason it can easily choose to send different data over the wire.

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Kassin Addict
Member

12 Posts
3/04
Posted - Mar 29 2004 : 1:12AM
I had a problem similar to Tinaka's. I found a pic of Katja Kassin on a website and I tried to save it to my iMac desktop. I thought that it was saved correctly, but when I tried to open it I got a message saying "Image cannot be displayed because it is corrupted". I tried a few more times to save the image, but the same thing kept happening.

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Sir Noel Plum
Senior Studmuffin

1001 Posts
2/03
Posted - Mar 29 2004 : 1:52AM
Couldn't you just copy the file out of your Temporary Internet Files directory? Or if you are really struggling if the picture is less than the dimensions of your screen you could 'print screen' onto your clipboard then paste and crop?

SNP.

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daviangel
Member

Only time I would buy a girl flowers is if she was in the hospital
455 Posts
1/04
Posted - Mar 29 2004 : 4:44AM
 
Tinaka
Member

953 Posts
8/03
Posted - Mar 30 2004 : 9:13AM
I did . Was difficult though because i didnt know the filename to look for(it was different to the when saving from the webpage) and they were all the same name.
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Evil_Rip
Senior Member

Power overwhelming
1117 Posts
12/99
Posted - Apr 2 2004 : 1:24AM
Disable java and save the picture after reloading the page.

Or I don't know why this is. But I have found that the pages that won't let you save the pictures In IE, Netscape will allow you to download.

Other valid uses of right clicking on an image is to enlarge them. If you use IE on a pc then you install the IE5 accessories you can right click on pictures to enlarge them.

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All Forums > Tech Talk > Tech Talk Forum Page 59Protected image files on websites

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