<s>
COS	B-Operating_System
(	O
China	B-Operating_System
Operating	I-Operating_System
System	I-Operating_System
)	O
is	O
a	O
Linux	O
kernel-based	O
mobile	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
developed	O
in	O
China	O
mainly	O
targeting	O
mobile	O
devices	O
,	O
tablets	O
and	O
set-top	O
boxes	O
.	O
</s>
<s>
It	O
is	O
being	O
developed	O
by	O
the	O
Institute	O
of	O
Software	O
at	O
the	O
Chinese	O
Academy	O
of	O
Sciences	O
(	O
ISCAS	O
)	O
together	O
with	O
Shanghai	O
Liantong	O
Network	O
Communications	O
Technology	O
to	O
compete	O
with	O
foreign	O
operating	O
systems	O
like	O
iOS	B-Application
and	O
Android	B-Application
.	O
</s>
<s>
The	O
operating	O
system	O
is	O
based	O
on	O
Linux	B-Operating_System
but	O
the	O
platform	O
is	O
closed	B-Application
source	I-Application
.	O
</s>
<s>
Security	O
and	O
the	O
risk	O
of	O
back	O
doors	O
in	O
devices	O
from	O
foreign	O
vendors	O
are	O
some	O
of	O
the	O
main	O
motivations	O
for	O
COS	B-Operating_System
.	O
Android	B-Application
had	O
almost	O
90%	O
of	O
the	O
smart	O
phone	O
market	O
when	O
COS	B-Operating_System
was	O
introduced	O
and	O
Apple	O
most	O
of	O
the	O
remaining	O
market	O
share	O
.	O
</s>
<s>
COS	B-Operating_System
looks	O
very	O
similar	O
to	O
Android	B-Application
and	O
has	O
its	O
own	O
Application	O
Portal	O
much	O
like	O
Android	B-Application
Market	I-Application
and	O
iOS	B-Application
App	I-Application
Store	I-Application
.	O
</s>
<s>
The	O
Linux	B-Operating_System
kernel	I-Operating_System
is	O
GPLv2	O
and	O
the	O
COS	B-Operating_System
framework	O
is	O
closed	B-Application
source	I-Application
and	O
licensed	O
by	O
the	O
originators	O
.	O
</s>
<s>
The	O
COS	B-Operating_System
Core	O
operating	O
system	O
is	O
based	O
on	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
and	O
can	O
be	O
seen	O
as	O
a	O
Linux	B-Application
distribution	I-Application
,	O
in	O
the	O
same	O
way	O
as	O
the	O
Android	B-Application
operating	I-Application
system	I-Application
.	O
</s>
<s>
According	O
to	O
the	O
official	O
statements	O
,	O
COS	B-Operating_System
supports	O
HTML5	B-Application
based	O
applications	O
and	O
Java	B-Language
based	O
applications	O
.	O
</s>
