<s>
Font	B-Operating_System
Book	I-Operating_System
is	O
a	O
font	O
manager	O
by	O
Apple	O
Inc	O
.	O
for	O
its	O
macOS	B-Application
operating	O
system	O
.	O
</s>
<s>
It	O
was	O
first	O
released	O
with	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
Panther	I-Operating_System
in	O
2003	O
.	O
</s>
<s>
Group	O
fonts	O
into	O
collections	O
,	O
which	O
can	O
then	O
be	O
used	O
in	O
all	O
Cocoa	B-Operating_System
programs	O
.	O
</s>
<s>
In	O
the	O
2003	O
–	O
2007	O
period	O
,	O
Apple	O
's	O
Font	B-Operating_System
Book	I-Operating_System
faced	O
some	O
criticism	O
regarding	O
an	O
inability	O
to	O
validate	O
and	O
auto-activate	O
fonts	O
.	O
</s>
<s>
These	O
features	O
were	O
added	O
to	O
Font	B-Operating_System
Book	I-Operating_System
with	O
the	O
release	O
of	O
Mac	B-Application
OS	I-Application
X	I-Application
Leopard	I-Application
.	O
</s>
