<s>
The	O
term	O
bozo	B-Operating_System
bit	I-Operating_System
has	O
been	O
used	O
in	O
two	O
contexts	O
.	O
</s>
<s>
Initially	O
a	O
weak	O
copy	B-Application
protection	I-Application
system	O
in	O
the	O
1980s	O
Apple	O
classic	B-Application
Mac	I-Application
OS	I-Application
,	O
the	O
term	O
"	O
flipping	O
the	O
bozo	B-Operating_System
bit	I-Operating_System
"	O
was	O
later	O
reused	O
to	O
describe	O
a	O
decision	O
to	O
ignore	O
a	O
person	O
's	O
input	O
.	O
</s>
<s>
In	O
early	O
versions	O
of	O
Apple	O
's	O
classic	B-Application
Mac	I-Application
OS	I-Application
,	O
the	O
"	O
bozo	B-Operating_System
bit	I-Operating_System
"	O
(	O
also	O
called	O
the	O
"	O
no	O
copy	O
"	O
flag	O
in	O
some	O
documentation	O
)	O
was	O
one	O
of	O
the	O
flags	O
in	O
the	O
Finder	B-Application
Information	O
Record	O
,	O
which	O
described	O
various	O
file	O
attributes	O
.	O
</s>
<s>
It	O
was	O
called	O
the	O
bozo	B-Operating_System
bit	I-Operating_System
because	O
it	O
was	O
copy	B-Application
protection	I-Application
so	O
weak	O
that	O
only	O
a	O
bozo	O
would	O
think	O
of	O
it	O
,	O
and	O
only	O
a	O
bozo	O
would	O
be	O
deterred	O
by	O
it	O
.	O
</s>
<s>
The	O
cassette	O
and	O
ROM	O
filing	O
systems	O
and	O
the	O
Advanced	B-Device
Disc	I-Device
Filing	I-Device
System	I-Device
of	O
Acorn	B-Operating_System
MOS	I-Operating_System
feature	O
a	O
rudimentary	O
copy	B-Application
protection	I-Application
mechanism	O
where	O
a	O
file	O
with	O
a	O
certain	O
flag	O
set	O
cannot	O
be	O
loaded	O
except	O
to	O
execute	O
it	O
.	O
</s>
<s>
Consumer-grade	O
dedicated	O
hardware	O
audio	O
disc	O
copiers	O
usually	O
honor	O
the	O
bozo	B-Operating_System
bit	I-Operating_System
,	O
and	O
will	O
refuse	O
to	O
copy	O
a	O
disc	O
with	O
the	O
bit	O
set	O
.	O
</s>
<s>
Professional	O
disc	O
copiers	O
ignore	O
the	O
bozo	B-Operating_System
bit	I-Operating_System
and	O
will	O
copy	O
a	O
protected	O
disc	O
.	O
</s>
<s>
In	O
his	O
1995	O
book	O
Dynamics	O
of	O
Software	O
Development	O
,	O
which	O
presented	O
a	O
series	O
of	O
rules	O
about	O
the	O
political	O
and	O
interpersonal	O
forces	O
that	O
drive	O
software	O
development	O
,	O
Jim	O
McCarthy	O
applied	O
the	O
bozo	B-Operating_System
bit	I-Operating_System
notion	O
to	O
the	O
realm	O
of	O
human	O
interaction	O
.	O
</s>
<s>
In	O
his	O
book	O
,	O
McCarthy	O
's	O
rule	O
#4	O
is	O
"	O
Do	O
n't	O
Flip	O
The	O
Bozo	B-Operating_System
Bit	I-Operating_System
"	O
.	O
</s>
