Extracting secured content?

I know this might be a touchy question, but I thought I'd ask it anyhow. More fool I .
I recently needed to extract high-resolution images from a PDF document that was secured against Page Extraction. This was a public filing with a local municipality (so the information was unambiguously free) obtained from that municipality, but the company that filed the electronic version chose to secure it. There's no question in my mind that I should have had full access to the images. Furthermore, I was on a deadline, so attempting to get a better format from the original source was not viable.
What's the best approach here?
On a very short timeframe, I ended up blowing up the images on a very large screen and taking screenshots. Lame but adequate.
Looking a second time more recently, I see that if I open the PDF in Preview.app and choose Export as PDF, it removes those restrictions, and then I can extract the images using Acrobat Pro.
Is there a better way? I'm always way of using Preview in any kind of critical workflow.
One imagines I could print to Postscript from Acrobat Pro and then Distill. I don't know that this would be better, and I could imagine I'd have to fight to defeat security encoding in the Postscript, if memory is a proper guide.
I guess I could patch pdftk to help me remove passwords. I could use ghostscript to do so. I could use qpdf.
I dunno.
Tangent:
Another problem I ended up with was how to extract an image that was stitched together from two rectangular portions (top and bottom). It would have been nice to select the two with the Edit Object tool and hit Edit Image, but that doesn't work. I can get them both in Illustrator as seperate images but that's not helpful. I can Save as Image the whole page and crop it in Photoshop. But ultimately easiest seemed to extract the two images and recomposit them in Photoshop. Which just seemed wrong. Thoughts?

Dave: I certainly respect the forum moderators' preference to not discuss certain techniques, but your justification is incorrect
Sorry, but irrespective of the assumed status of the document, bypassing copyright protection measures is a breach of DMCA s1201.
That may be true, but the document in question is not copyrighted. It is in the public domain. As such, the Digital Millenium Copyright Act does not apply, and it is not a 17 USC 1201 circumvention. Indeed, §1201(a) is quite explicit:
(A) No person shall circumvent a technological measure that effectively controls access to a work protected under this title.
Public domain documents are not such works. And in this municipality, such documents are public domain.
In answer to your second question about image fragments, there is a Preflight fixup to detect and merge them.
Thanks.

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