Mac users prompted for password when reading PDFs from Internet

We produce PDFs with a randomly generated password to "protect" them from being editted.
Periodically, we get complaints from Mac users who, upon clicking the PDF link, are prompted to enter the password.  My guess at this point is that they have Acrobat (not Reader) installed and it's wanting to open the PDF in an editable mode by default. 
Does this sound correct?
What instructions should we give them to work around this issue?  Is there a settings change for this (least desireable) or a Ctrl-Click sequence to get it in "read-only" mode?
We're not Mac folks -- don't have one in-house -- so we haven't had an environment to experiment in.
BTW:  The issue is with our clients' customers so we need something fairly non-technical for directions.
Thanks, Scott

Scott, Check your private messages.

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