<s>
It	O
allows	O
images	O
to	O
be	O
printed	O
directly	O
from	O
digital	B-Device
cameras	I-Device
to	O
a	O
printer	O
,	O
without	O
having	O
to	O
connect	O
the	O
camera	O
to	O
a	O
computer	O
.	O
</s>
<s>
PictBridge	O
is	O
typically	O
implemented	O
using	O
USB	B-Protocol
ports	I-Protocol
and	O
the	O
USB	B-Protocol
protocol	O
.	O
</s>
<s>
PictBridge-capable	O
printers	O
typically	O
have	O
a	O
USB	B-Protocol
type	O
A	O
port	O
which	O
is	O
connected	O
by	O
cable	O
to	O
the	O
USB	B-Protocol
port	I-Protocol
of	O
a	O
PictBridge-capable	O
digital	B-Device
camera	I-Device
(	O
typically	O
a	O
Mini-B	O
)	O
.	O
</s>
<s>
In	O
practice	O
,	O
this	O
means	O
that	O
PictBridge	O
cannot	O
be	O
implemented	O
as	O
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
,	O
other	O
than	O
by	O
reverse-engineering	O
the	O
protocol	O
,	O
if	O
publishing	O
source	O
code	O
of	O
an	O
implementation	O
of	O
the	O
PictBridge	O
standard	O
is	O
considered	O
to	O
count	O
as	O
"	O
disclosing	O
information	O
"	O
from	O
the	O
specification	O
.	O
</s>
<s>
A	O
printer	O
may	O
implement	O
functions	O
similar	O
to	O
a	O
PictBridge	O
printer	O
without	O
the	O
non-disclosure	O
agreement	O
merely	O
by	O
treating	O
the	O
camera	O
's	O
memory	O
as	O
a	O
USB	B-Architecture
mass	I-Architecture
storage	I-Architecture
device	I-Architecture
,	O
although	O
the	O
user	O
interface	O
for	O
image	O
selection	O
would	O
necessarily	O
be	O
on	O
the	O
printer	O
rather	O
than	O
the	O
camera	O
in	O
this	O
case	O
.	O
</s>
