List of Printers Which Do or Do Not Display Tracking Dots

Introduction

This is a list in progress of color laser printer models that do or do
not print yellow tracking dots on their output.

Limitations of this information

A "no" simply means that we couldn't see yellow dots; it
does not prove that there is no forensic watermarking
present. (For example, the HP Color LaserJET 8500 series does
not include any yellow tracking dots that we can see, but it may still
include some kind of forensic marking, since the majority of other
Color LaserJET models do. Other forensic marking
techniques have been invented, and we do not yet know how to
determine whether these techniques are used by a particular
printer.)

A "yes" simply means that we (or another source, as noted)
saw yellow dots that appeared anomalous to us. Until
we decipher the marking schemes or receive other confirmation, this
does not constitute proof that any particular kind of information is
represented by these dots. In a very few cases, for example, they
might be the result of a dithering
technique, rather than a forensic mark, or they could be the
result of a poorly calibrated printer. In most cases, we are
confident that the arrangement of dots is intentional and is intended
to track users.

Sources of information

We have employed three sources of information. We looked at
printer output under a blue light and/or a computer microscope; we
consulted press reports about printers (e.g. at Druckerchannel); we relied on
printer manuals and other manufacturer statements. We welcome
additional statements by manufacturers, resellers, or technicians.

Thanks to our friends at software firms and symphonies, public schools
and physics labs, semiconductor fabs and ice cream parlors, in about a
dozen countries around the world.

Table of printers

Manufacturer	Model	Dots?	Comments
Brother
	HL-2700CN	yes	volunteer test
	HL-4200CN	yes	EFF test
Canon
	CLC 1000	yes	EFF test
	CLC 2400	yes	EFF test
	CLC 3002	yes	EFF test
	CLC 4000	yes	EFF test
	CLC 5000+	yes	EFF test
	CLC-iR 3200-C1	yes	EFF test
	Color imageRUNNER C2570	yes	EFF test
	Color imageRUNNER C3100CN	yes	EFF test
	Color imageRUNNER C3200	yes	EFF test
	Color imageRUNNER C3200N	yes	EFF test
	Color imageRUNNER C3220	yes	EFF test
	Color Laser Copier 1150	yes	EFF test
	Imageclass MF8170C	yes	EFF test
	LBP 2410	unclear	faint dots; could be artifacts
Dell
	3000CN	yes	EFF test
	3100CN	yes	EFF test
	5100CN	yes	EFF test
Epson
	AcuLaser C900	yes	EFF test
	AcuLaser C1100	yes	EFF test
	AcuLaser C1500	yes	EFF test
	AcuLaser C1900	yes	EFF test
	AcuLaser C3000	yes	EFF test
	AcuLaser C4000	yes	EFF test
Fuji: see Xerox
Hewlett-Packard
	Color LaserJET 1550L	yes	EFF test
	Color LaserJET 1600	yes	EFF test
	Color LaserJET 2250LN	no (??)	EFF test
	Color LaserJET 2500	yes	EFF test
	Color LaserJET 2500L	yes	EFF test
	Color LaserJET 2500N	yes	EFF test
	Color LaserJET 2550	yes	EFF test
	Color LaserJET 2550L	yes	EFF test
	Color LaserJET 2550N	yes	EFF test
	Color LaserJET 2600N	yes	EFF test
	Color LaserJET 2680	yes	EFF test
	Color LaserJET 2700N	yes	volunteer test
	Color LaserJET 2840	yes	EFF test
	Color LaserJET 3500	yes	EFF test
	Color LaserJET 3550	yes	EFF test
	Color LaserJET 3600DN	yes	EFF test
	Color LaserJET 3700	yes	EFF test
	Color LaserJET 3700DN	yes	EFF test
	Color LaserJET 3700N	yes	EFF test
	Color LaserJET 4500	no	EFF test
	Color LaserJET 4500DN	no	EFF test
	Color LaserJET 4500N	no	EFF test
	Color LaserJET 4550	no	EFF test
	Color LaserJET 4550N	no	EFF test
	Color LaserJET 4600	yes	EFF test
	Color LaserJET 4600DN	yes	EFF test
	Color LaserJET 4600HDN	yes	EFF test
	Color LaserJET 4600N	yes	EFF test
	Color LaserJET 4650	yes	EFF test
	Color LaserJET 4650DN	yes	EFF test
	Color LaserJET 4650DTN	yes	EFF test
	Color LaserJET 4700	yes	volunteer test
	Color LaserJET 4700DN	yes	volunteer test
	Color LaserJET 4700DTN	yes	volunteer test
	Color LaserJET 5M	no	EFF test
	Color LaserJET 5100CN	yes	EFF test
	Color LaserJET 5500	yes	EFF test
	Color LaserJET 5500ATN	yes	EFF test
	Color LaserJET 5500DN	yes	EFF test
	Color LaserJET 5500HDN	yes	EFF test
	Color LaserJET 5550	yes	EFF test
	Color LaserJET 5550DN	yes	EFF test
	Color LaserJET 5550DTN	yes	EFF test
	Color LaserJET 8500	no	EFF test
	Color LaserJET 8500DN	no	EFF test
	Color LaserJET 8550	no	EFF test
	Color LaserJET 8550DN	no	EFF test
	Color LaserJET 8550GN	no	EFF test
	Color LaserJET 9500	yes	EFF test
	Color LaserJET 9500HDN	yes	EFF test
	Color LaserJET 9500MFP	yes	EFF test
IBM
	Infoprint Color 1454	unclear	dithering?
	Infoprint Color 1464 PS3	yes	dithering?
Konica    (Konica/Minolta)
	Bizhub C252	yes	EFF test
	Bizhub C350	yes	EFF test
	Colorforce 1501	yes	EFF test
	Colorforce 8050	yes	EFF test
	DialtaColor CF 2001	unclear	dithering?
	DialtaColor CF 2002	unclear	dithering?
	Ikon CPP500E	yes	EFF test
	Magicolor 2 Desklaser	no	EFF test
	Magicolor 2200 DL	yes	EFF test
	Magicolor 2210	yes	EFF test
	Magicolor 2300 DL	yes	EFF test
	Magicolor 2300 W	yes	EFF test
	Magicolor 2350	yes	EFF test
	Magicolor 2350 EN	yes	EFF test
	Magicolor 2400 W	yes	EFF test
	Magicolor 2430 DL	yes	EFF test
	Magicolor 2450	yes	EFF test
	Magicolor 3100	yes	EFF test
	Magicolor 3300	yes	EFF test
	Magicolor 5450	yes	EFF test
	Magicolor 7300	yes	EFF test
Kyocera
	C2630D	yes	EFF test
	FS-C5016N	yes	EFF test
	FS-C5020N	yes	EFF test
	FS-C5030N	yes	EFF test
	FS-C8008	yes	EFF test
	Mita KM-C2230	yes	EFF test
Lanier
	LD238C	yes	EFF test
	LP125CX/LP126CN	yes	EFF test
Lexmark
	C510	yes	EFF test
	C720	unclear	retest
	C752	yes	EFF test
	C752N	yes	EFF test
	C760	yes	EFF test
	C910	yes	EFF test
	C912	yes	EFF test
Minolta: see Konica
NRG
	DSc38	yes	EFF test
OkiDATA     (Oki)
	C5100	no	EFF test
	C5150	no	EFF test
	C5150N	no	EFF test
	C5200	no	EFF test
	C5300	no	EFF test
	C7200	no	EFF test
	C7350	no	EFF test
	C7400	no	EFF test
	C7400N	no	EFF test
	C9200	no	EFF test
	C9300	no	EFF test
	C9400	no	EFF test
	MIP C5540	no	EFF test
	OkiLAN 8100E	no	EFF test
Panasonic
	Workio KXCL-500	yes	EFF test
Ricoh     (see also Savin)
	Aficio 1224C	yes	EFF test
	Aficio 1232C	yes	EFF test
	Aficio CL 2000	yes	press report
	Aficio CL 3000	yes	EFF test
	Aficio CL 3000E	yes	EFF test
	Aficio CL 6010	yes	EFF test
	Aficio CL 7000	yes	EFF test
	AP 206	yes	EFF test
	Infotec/Danka ISC 2838	yes	EFF test
Samsung
	CLP-500	no	EFF test
	CLP-510	no	EFF test
	CLP-550	no	EFF test
	CLP-550N	no	EFF test
Savin
	C3210	yes	EFF test
	CLP35	yes	EFF test
Tektronix: see Xerox
Toshiba
	eStudio 210c	yes	mfr. statement
	eStudio 211c	yes	mfr. statement
	eStudio 310c	yes	mfr. statement
	eStudio 311c	yes	mfr. statement
	eStudio 2100c	yes	mfr. statement
	eStudio 3100c	yes	mfr. statement
	eStudio 3511	yes	EFF test
	FC15	yes	mfr. statement
	FC15i	yes	mfr. statement
	FC22	yes	mfr. statement
	FC22i	yes	mfr. statement
	FC25P	yes	mfr. statement
	FC25Pi	yes	mfr. statement
	FC70	yes	mfr. statement
Xerox   (Tektronix)
	DocuColor 12	yes	EFF test
	DocuColor 40	yes	EFF test
	DocuColor 1521	yes	EFF test
	DocuColor 1632	yes	EFF test
	DocuColor 2000	yes	mfr. statement
	DocuColor 2045	yes	EFF test
	DocuColor 2240	yes	EFF test
	DocuColor 3535	yes	EFF test
	DocuColor 5252	yes	EFF test/mfr. statement
	DocuColor 6060	yes	EFF test/mfr. statement
	Phaser 560	no	EFF test
	Phaser 740	no	EFF test
	Phaser 750 (Z750V)	no	EFF test
	Phaser 750P	no	EFF test
	Phaser 790	yes	EFF test
	Phaser 850DP	no	EFF test
	Phaser 860DP	no	EFF test
	Phaser 1235	no	EFF test
	Phaser 6100	no	EFF test
	Phaser 6200	no	EFF test
	Phaser 6200DP	no	EFF test
	Phaser 6250DP	no	EFF test
	Phaser 6350DP	no	EFF test
	Phaser 7300DN	no	EFF test
	Phaser 7300DT	no	EFF test
	Phaser 7700	no	EFF test
	Phaser 7750DN	no	EFF test
	Phaser 8200DP	no	EFF test
	Phaser 8200DX	no	EFF test
	Phaser 8400	no	dithering?
	Phaser 8400B	unclear	dithering?
	Phaser 8400DP	unclear	dithering?
	Phaser 8400DX	unclear	dithering?
	Phaser 8400N	unclear	dithering?
	Phaser 8440DP	unclear	dithering?
	Phaser 8550	no	EFF test
	Phaser 8550DP	no	EFF test
	Phaser 8560MFP/D	no	EFF test
	WorkCentre M24	yes	EFF test
	WorkCentre Pro (all models)	yes	mfr. statement