Nothing has changed with Acrobat in any releases over the last several years in this regard.
What your customer needs to do is use the protection mechanism within Acrobat to disallow changes but allow page extraction. It works (I just tried it myself).
Of course using rasterization as a “protection mechanism” won't work since OCR (available for quite a while in Acrobat) can be used to create text from images. Plus, rasterization not only bulks up the size of a PDF file, but effectively ruins its quality.
The choice in Acrobat Security is worded : "Changes Allowed: Any except extracting pages" Which is opposite of what I'm trying to accomplish, unless it's worded funny and I'm misunderstanding. Thanks Dov. Appreciate your reply.