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#1
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Protecting an Excel file published on web from unauthorized copying
Is there a way protect an Excel file (and associated formulas) which is
published on web from unauthorized copying and/or create time limited functionality? Perhaps, converting excel into flash? thanks. |
#2
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Protecting an Excel file published on web from unauthorized copyin
Short answer: you put it on the web in such a manner that I can download it,
and there's no stopping me then! If you password protect it, I'll crack the passwords in the amount of time it takes me to bring up a program I have designed to do exactly that and point it to the file I've downloaded. Once it's open, I have pretty much free rein to do what I want. Even if you try to time limit the functionality via code, I can stop the code from running - I may not have access to your functions and macros at that point IF you've locked up the VBA project with a password, but I think I can get around that also (haven't tried, but I have the methodoligy in mind - may or may not require cracking password to the VBA project which is tougher to do than cracking the workbook or worksheet password(s) -- but again, there are tools). I've never considered trying to convert Excel to Flash - no expertise in that at all, I suppose it could be done? If you don't need any inter-action between viewers and the workbook, you might consider converting it to an Adobe .pdf file, you can assign limitations on what can be done to those if you use Adobe Acrobat Pro (a few hundred $$). Or consider just taking screen shots of the sheet(s) if you can get it all on a screen to shoot it, and just posting the .jpg or .gif file you create doing that? "kvin" wrote: Is there a way protect an Excel file (and associated formulas) which is published on web from unauthorized copying and/or create time limited functionality? Perhaps, converting excel into flash? thanks. |
#3
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Protecting an Excel file published on web from unauthorized copyin
"JLatham" <HelpFrom @ Jlathamsite.com.(removethis) wrote in message ... Short answer: you put it on the web in such a manner that I can download it, and there's no stopping me then! If you password protect it, I'll crack the passwords in the amount of time it takes me to bring up a program I have designed to do exactly that and point it to the file I've downloaded. Once it's open, I have pretty much free rein to do what I want. Even if you try to time limit the functionality via code, I can stop the code from running - I may not have access to your functions and macros at that point IF you've locked up the VBA project with a password, but I think I can get around that also (haven't tried, but I have the methodoligy in mind - may or may not require cracking password to the VBA project which is tougher to do than cracking the workbook or worksheet password(s) -- but again, there are tools). I've never considered trying to convert Excel to Flash - no expertise in that at all, I suppose it could be done? If you don't need any inter-action between viewers and the workbook, you might consider converting it to an Adobe .pdf file, you can assign limitations on what can be done to those if you use Adobe Acrobat Pro (a few hundred $$). Or consider just taking screen shots of the sheet(s) if you can get it all on a screen to shoot it, and just posting the .jpg or .gif file you create doing that? "kvin" wrote: Is there a way protect an Excel file (and associated formulas) which is published on web from unauthorized copying and/or create time limited functionality? Perhaps, converting excel into flash? thanks. ----------- one person just asked me is there a way to prevent downloading(copying/distributing) an .xls file placed on web. Since I am not excel expert, i just wanted ask some advice. I personally consider that this is very difficult, if not possible at all. One of the way I see is convert Excel spreadsheets into html web pages with embedded JavaScript. This html pages will look and function in the same way as the original spreadsheet. Then I can encrypt html page with some html protector program, that makes the decryption very disgusting and hard procedure, so no anyone want to be caught doing decoding.. This way even is someone will download page it would not be a problem. The only question is how big is this original xls spreadsheet, since converting to html add many extra code. |
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