While the resulting pdf file I got from pdf-printing this swf wasn't exactly like the original (each page was printed twice), it actually is a usable file.
I just uploaded a 7zip file with a small swf inside. Regarding the small web format files, they can be printed just as well, so you actually would have to go through some more advanced way of converting to swf to make it a bit more complicated for the user to print them. It sure was very high-tech stuff for the time, unfortunately, it didn't work, people simply modified the code to skip the verification process. I still can remember the case of a software vendor that marked with a laser beam some sectors of their software disks (3½-inch floppy disks) the idea was that the software had some advanced routines to detect them, and so, if someone were to copy the software this method would render the copy useless. I've been in the IT area all my life, and while I understand the reasoning behind, this "protecting info" effort has been a worthless struggle.
Who would have imagined this? Really surprising! I just searched a bit:
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