Programming with .NET - General

Re: Re: Protect pdf document from download

Maud — Wed, 03 Jun 2009 07:19:49 GMT

Agree with Jay, convert pdf to xps on serverside and display in silverlight.

sample

http://www.amyuni.ca/PageTurnPdf/Default.html

article

http://www.amyuni.com/silverlight/article.php

Re: Re: Protect pdf document from download

Vinayak_Ait — Thu, 28 May 2009 16:32:02 GMT

Thanks for reply,

Can someone tell me how to embed pdf file in silvrlight so that my site's visitor can view the pdf but should not be able to download pdf file.

It's urgent,

Thanks in advance

Re: Protect pdf document from download

metal — Thu, 28 May 2009 13:56:42 GMT

If the user can view a PDF then they have already downloaded it, In the same way if you view an image on a web page it is downloaded to the users machine before being displayed.

The only way around this is to not use raw data, the common solution for images is to use flash/silverlight to display an image that is a propriatory format, thus if a user is able to intercept the flash/silverlight downloading the iamge data they can not load it into photoshop as photoshop will not recognise the format.

So to reach your requirements,

1. Can view PDF

2. can not download PDF

3. can not copy PDF

4. no temp files

Number one, you have to supply the a client application (i.e. silverlight) that will interpret 'some' data and display it to appear as PDF

Number two, the PDF file does not reside on the server as reachable, instead a web service will stream the data.

Number three, I assume you mean 'can not take a copy', if at any time your web server sends PDF data (file or streaming) the users machine can intercept and copy/save that data.

Number four, really the same as three and it doesn not matter if there is a temp file if it is your propriatory data format describing a PDF as without your client application (i.e. silverlight) it is useless.

I hope this makes things slightly clearer.

bottom line, never trust a client to do what you WANT it to do, because it can do what it damn well pleases.

Re: Protect pdf document from download

jay nanavati — Thu, 28 May 2009 13:19:54 GMT

Do you want to implement this using Silverlight?

then check this:

http://www.amyuni.com/silverlight/index.php

if you want to do it with Flash:

http://board.flashkit.com/board/showthread.php?t=745702

Protect pdf document from download

Vinayak_Ait — Thu, 28 May 2009 12:45:42 GMT

Hi,

I uploaded pdf file to server so that my site's visitor only able to view pdf but should not be able to download, save, copy pdf. and not have a temp file of the pdf ever be downloaded to their machine.
How can I get above behaviour and protect pdf from download?
Thanks in advance