Adobe Reader: viewer cannot decrypt this document.

When a client opens an open fill in form on the web they get the error viewer cannot decrypt this document.  

is this adobe version specific ?
how can I get the form so anyone with adobe reader of (say 5 or 6) can open the form without an error?

form is
I would like this form to be hassle free - thank you.
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I got this:

Is there some sort of scripting attached within the PDF file or does the computer on which you created the pdf file have a virus?
I was able to successfully open the form using Adobe Reader 8 in both IE and Firefox.
Wonderful fuzzboxer, but "how can I get the form so anyone with adobe reader of (say 5 or 6) can open the form without an error?"

For that, he will probably need to completely redo the form, using something like will get you the backward compatibility without the dependency on Adobe spyware reader versions 7 and plus.

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Well, he has a link to grab the most recent version of Adobe Reader.  I would suggest adding a disclaimer that states you would need to download the most recent version if you encounter an error.

Another solution would be to build the form with HTML/CSS and no one needs a program at all.
Anything but Adobe 6+ makes me happy, I'm just pointing out his requirements were 5 or 6, not 7 or 8.  Sometimes those are dictated by managers or clients, not by the whims of the developer.
If that's the case, then Adobe Acrobat has a save option to Make Compatible with version 4.0 or later.

Here are the PDF compatibility levels:
Good information!
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