i want to know that is it possible for inkjet printers to print any hidden info like serial no. or date & time as found with laser printers.
what your talking about is called metadata and nowadays is hidden in nearly everything, just another sign of "big brother" in my opinion.
as to the actual yellow printer id dots mentioned in that link then no they are not known with inkjet printers.
The yellow dot technology appears to apply only to color laser printers and copiers. Monochrome laser, LED and inkjet printers lack the yellow toner necessary to print the dots, and therefore do not produce these markings. In addition, because Xerox developed the yellow dot technology during the 1990s, this affects only those printers made since then. Experts have identified yellow dot marks on documents from many printer makes, including Xerox, Hewlett-Packard, Toshiba and Canon. At the time of publication, experts know of no other secret identifying marks in printed materials, although the possibility exists, according to the Electronic Freedom Foundation.
List of Printers Which Do or Do Not Display Tracking Dots
(Added 2015) Some of the documents that we previously received through FOIA suggested that all major manufacturers of color laser printers entered a secret agreement with governments to ensure that the output of those printers is forensically traceable. Although we still don't know if this is correct, or how subsequent generations of forensic tracking technologies might work, it is probably safest to assume that all modern color laser printers do include some form of tracking information that associates documents with the printer's serial number. (If any manufacturer wishes to go on record with a statement to the contrary, we'll be happy to publish that here.)
Forensic investigations of the source of documents produced with other printing technologies are also possible, but, as far as we know, other kinds of printers do not deliberately encode their serial numbers in their output.
Edited by terry1966, 10 March 2015 - 03:22 PM.