Yeah, I know it's a loosing battle with techies! :)

It's not only with techies. With any PostScript printer you can simply
"print to a file" and have a fully functional electronic PostScript
document. You can download dozens of free PDF printer drivers, and
none of those is forced to have a "PDF" string in the printer or port
name. And what do you do if one of your customers has a printer whose
driver has a "PDF" in its name? (E.g. a PDF-enabled printer, which
natively supports PDF documents.)

Even if you had a flawless fake-vs-real printer detector, one could
always print and scan or color-copy, as you say yourself.

So why are you even bothering? It looks like you're putting effort
into reaching a solution which:
- Will be easily circumvented,
- Will piss off users due to false positives (e.g. ordinary printers
with a "PDF" string in their names), and
- Doesn't really need to be circumvented due to the possibilities of scanning.

Is that really worth the effort? Don't take this the wrong way, I'm
really interested, after all I don't know what you need this for. But
I guess the only way to get copy-protected documents is to use
suitable technology (holograms, watermarks, etc.), like modern money
printing machines do, isn't it?

Fabian

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