<s>
A	O
certificate	B-License
of	I-License
authenticity	I-License
(	O
COA	O
)	O
is	O
a	O
seal	O
or	O
small	O
sticker	O
on	O
a	O
proprietary	O
computer	B-Application
program	I-Application
,	O
t-shirt	O
,	O
jersey	O
,	O
or	O
any	O
other	O
memorabilia	O
or	O
art	O
work	O
,	O
especially	O
in	O
the	O
world	O
of	O
computers	O
and	O
sports	O
.	O
</s>
<s>
Artwork	O
or	O
posters	O
come	O
with	O
a	O
certificate	B-License
of	I-License
authenticity	I-License
signed	O
and	O
sealed	O
by	O
a	O
reputable	O
appraiser	O
or	O
auction	O
house	O
.	O
</s>
