How to bypass copy protection in HP LJ M1536?

Question

System administration

Found an interesting feature in the HP LJ M1536 printer: copy protection of the scanned document.
When printing scanned documents, letters appear gray on the sheet. At first he sinned on the printer, firewood and so on. Reflashed, reinstalled, reset settings. Then I called the HP TP, they told me that this was not a bug, but a feature - such as copy protection of documents, so that it was immediately clear that this was a copy.
Question. How to bypass this protection?
upd1
here are the screenshots
Printing a scan in MFP M1536dnf https://www.dropbox.com/s/5wdetubybgtxg45/2014-04-... - disgusting gray squares
Printing the same scan on hp 1020 https://www.dropbox.com/ s/l15f1584qxbeca5/2014-04-... - average, but it will do
Printing a copy (without the participation of a computer) on the M1536dnf MFP https://www.dropbox.com/s/bt1xl0w36ef0mma/2014-04-... - generally ideal
UPD2
called hp TP 5 times.
3 times I was advised all sorts of obscure actions such as reflashing the MFP, reinstalling the drivers, installing some HP printing utilities.
2 times I was told about the protection of the press. Type in the brains of the printer itself, there is such a feature. She doesn't turn off. I don't know who to believe.

Answer 1

What format are the documents in? If in JPG, then gray streaks on sharp black-and-white transitions are a compression artifact. View them on the screen in high resolution.
Scan to TIFF, there will be no such artifacts.