<s>
Microsoft	B-Application
Silverlight	I-Application
is	O
a	O
discontinued	O
application	B-Application
framework	I-Application
designed	O
for	O
writing	O
and	O
running	O
rich	B-Application
web	I-Application
applications	I-Application
,	O
similar	O
to	O
Adobe	O
's	O
runtime	B-Device
,	O
Adobe	B-Operating_System
Flash	I-Operating_System
.	O
</s>
<s>
A	O
plugin	O
for	O
Silverlight	B-Application
is	O
still	O
available	O
for	O
a	O
very	O
small	O
number	O
of	O
browsers	O
.	O
</s>
<s>
While	O
early	O
versions	O
of	O
Silverlight	B-Application
focused	O
on	O
streaming	O
media	O
,	O
later	O
versions	O
supported	O
multimedia	O
,	O
graphics	O
,	O
and	O
animation	O
,	O
and	O
gave	O
support	O
to	O
developers	O
for	O
CLI	B-Language
languages	I-Language
and	O
development	B-Application
tools	I-Application
.	O
</s>
<s>
Silverlight	B-Application
was	O
one	O
of	O
the	O
two	O
application	O
development	O
platforms	O
for	O
Windows	B-Protocol
Phone	I-Protocol
,	O
but	O
web	O
pages	O
using	O
Silverlight	B-Application
did	O
not	O
run	O
on	O
the	O
Windows	B-Protocol
Phone	I-Protocol
or	O
Windows	B-Operating_System
Mobile	I-Operating_System
versions	O
of	O
Internet	B-Application
Explorer	I-Application
,	O
as	O
there	O
was	O
no	O
Silverlight	B-Application
plugin	O
for	O
Internet	B-Application
Explorer	I-Application
on	O
those	O
platforms	O
.	O
</s>
<s>
Microsoft	O
terminated	O
support	O
for	O
Silverlight	B-Application
on	O
Internet	B-Application
Explorer	I-Application
11	I-Application
(	O
the	O
last	O
remaining	O
web	O
browser	O
still	O
supporting	O
Silverlight	B-Application
)	O
on	O
October	O
12	O
,	O
2021	O
.	O
</s>
<s>
It	O
is	O
supported	O
on	O
Windows	B-Application
8.1	O
and	O
later	O
and	O
Windows	B-Application
Server	O
2012	O
and	O
later	O
,	O
and	O
e.g.	O
</s>
<s>
Windows	B-Application
Embedded	O
POSReady	O
7	O
and	O
Windows	B-Application
Thin	O
PC	O
,	O
while	O
e.g.	O
</s>
<s>
Windows	B-Device
7	I-Device
and	O
earlier	O
do	O
not	O
get	O
security	O
updates	O
.	O
</s>
<s>
According	O
to	O
statowl.com,	O
Microsoft	B-Application
Silverlight	I-Application
had	O
a	O
penetration	O
of	O
64.2	O
%	O
in	O
May	O
2011	O
.	O
</s>
<s>
Usage	O
on	O
July	O
2010	O
was	O
53.6	O
%	O
,	O
whereas	O
market	O
leader	O
Adobe	B-Operating_System
Flash	I-Operating_System
was	O
installed	O
on	O
95.3	O
%	O
of	O
browsers	O
,	O
and	O
Java	O
was	O
supported	O
on	O
76.5	O
%	O
of	O
browsers	O
.	O
</s>
<s>
Silverlight	B-Application
was	O
used	O
to	O
provide	O
video	O
streaming	O
for	O
the	O
NBC	O
coverage	O
of	O
the	O
2008	O
Summer	O
Olympics	O
in	O
Beijing	O
,	O
the	O
2010	O
Winter	O
Olympics	O
in	O
Vancouver	O
,	O
and	O
the	O
2008	O
conventions	O
for	O
both	O
major	O
United	O
States	O
political	O
parties	O
.	O
</s>
<s>
Silverlight	B-Application
was	O
also	O
used	O
by	O
Amazon	B-Application
Video	I-Application
and	O
Netflix	O
for	O
their	O
instant	O
video	O
streaming	O
services	O
,	O
but	O
Netflix	O
said	O
in	O
its	O
Tech	O
Blog	O
in	O
2013	O
that	O
,	O
since	O
Microsoft	O
had	O
announced	O
Silverlight	B-Application
's	O
end-of-life	O
,	O
they	O
would	O
be	O
moving	O
to	O
HTML5	B-Application
video	O
.	O
</s>
<s>
Industry	O
observers	O
announced	O
the	O
death	O
of	O
Silverlight	B-Application
as	O
early	O
as	O
2011	O
.	O
</s>
<s>
Internally	O
,	O
even	O
proponents	O
of	O
the	O
technology	O
thought	O
Extensible	B-Device
Application	I-Device
Markup	I-Device
Language	I-Device
as	O
a	O
concept	O
was	O
a	O
bad	O
idea	O
from	O
the	O
start	O
.	O
</s>
<s>
In	O
2012	O
,	O
Microsoft	O
deprecated	O
Silverlight	B-Application
for	O
HTML5	B-Application
in	O
Windows	B-Application
8	I-Application
,	O
but	O
as	O
of	O
the	O
beginning	O
of	O
2015	O
,	O
it	O
was	O
not	O
clear	O
what	O
Microsoft	O
's	O
official	O
position	O
was	O
on	O
Silverlight	B-Application
's	O
future	O
.	O
</s>
<s>
In	O
July	O
2015	O
,	O
a	O
Microsoft	O
blog	O
post	O
clarified	O
that	O
,	O
"	O
…	O
we	O
encourage	O
companies	O
that	O
are	O
using	O
Silverlight	B-Application
for	O
media	O
to	O
begin	O
the	O
transition	O
to	O
DASH/MSE/CENC/EME	O
based	O
designs	O
"	O
.	O
</s>
<s>
Microsoft	O
planned	O
to	O
terminate	O
Silverlight	B-Application
support	O
on	O
October	O
12	O
,	O
2021	O
.	O
</s>
<s>
Support	O
for	O
IE7	B-Application
–	O
8	O
was	O
removed	O
between	O
2014	O
and	O
2016	O
,	O
depending	O
on	O
the	O
OS	B-General_Concept
.	O
</s>
<s>
Support	O
for	O
IE9	B-Application
and	O
IE10	B-Application
has	O
also	O
ended	O
"	O
or	O
though	O
 [ sic ] 	O
the	O
support	O
lifecycle	O
of	O
the	O
underlying	O
browsers	O
,	O
whichever	O
is	O
shorter.	O
"	O
</s>
<s>
There	O
is	O
no	O
Silverlight	B-Application
plugin	O
available	O
for	O
Microsoft	B-Application
Edge	I-Application
.	O
</s>
<s>
It	O
has	O
not	O
been	O
supported	O
by	O
Google	B-Application
Chrome	I-Application
since	O
September	O
2015	O
or	O
by	O
Firefox	B-Application
since	O
March	O
2017	O
.	O
</s>
<s>
,	O
about	O
0.02	O
%	O
of	O
sites	O
used	O
Silverlight	B-Application
,	O
less	O
than	O
1.5	O
%	O
used	O
the	O
also	O
discontinued	O
Adobe	B-Operating_System
Flash	I-Operating_System
Player	O
,	O
and	O
less	O
than	O
0.013	O
%	O
use	O
Java	O
client-side	O
(	O
while	O
3.7	O
%	O
use	O
Java	O
server-side	O
)	O
.	O
</s>
<s>
Silverlight	B-Application
provides	O
a	O
retained	O
mode	O
graphics	O
system	O
similar	O
to	O
Windows	B-Device
Presentation	I-Device
Foundation	I-Device
(	O
WPF	O
)	O
,	O
and	O
integrates	O
multimedia	O
,	O
graphics	O
,	O
animations	O
,	O
and	O
interactivity	B-General_Concept
into	O
a	O
single	O
run-time	B-Device
environment	I-Device
.	O
</s>
<s>
In	O
Silverlight	B-Application
applications	O
,	O
user	B-Application
interfaces	I-Application
are	O
declared	O
in	O
Extensible	B-Device
Application	I-Device
Markup	I-Device
Language	I-Device
(	O
XAML	B-Device
)	O
and	O
programmed	O
using	O
a	O
subset	O
of	O
the	O
.NET	B-Application
Framework	I-Application
.	O
</s>
<s>
XAML	B-Device
can	O
be	O
used	O
for	O
marking	O
up	O
the	O
vector	O
graphics	O
and	O
animations	O
.	O
</s>
<s>
Silverlight	B-Application
can	O
also	O
be	O
used	O
to	O
create	O
Windows	B-Application
Sidebar	B-Application
gadgets	I-Application
for	O
Windows	B-Application
Vista	I-Application
.	O
</s>
<s>
Silverlight	B-Application
supports	O
H.264	B-Application
video	O
,	O
Advanced	B-Application
Audio	I-Application
Coding	I-Application
,	O
Windows	B-Device
Media	I-Device
Video	I-Device
(	O
WMV	B-Device
)	O
,	O
Windows	B-Application
Media	I-Application
Audio	I-Application
(	O
WMA	B-Application
)	O
,	O
and	O
MPEG	B-Application
Layer	I-Application
III	I-Application
(	O
MP3	B-Application
)	O
media	O
content	O
across	O
all	O
supported	O
browsers	O
without	O
requiring	O
Windows	B-Device
Media	I-Device
Player	I-Device
,	O
the	O
Windows	B-Device
Media	I-Device
Player	I-Device
ActiveX	B-Application
control	I-Application
,	O
or	O
Windows	B-Device
Media	I-Device
browser	O
plug-ins	O
.	O
</s>
<s>
Because	O
Windows	B-Device
Media	I-Device
Video	I-Device
9	I-Device
is	O
an	O
implementation	O
of	O
the	O
Society	O
of	O
Motion	O
Picture	O
and	O
Television	O
Engineers	O
(	O
SMPTE	O
)	O
VC-1	B-Operating_System
standard	O
,	O
Silverlight	B-Application
also	O
supports	O
VC-1	B-Operating_System
video	O
.	O
</s>
<s>
According	O
to	O
the	O
end	O
user	O
license	O
agreement	O
VC-1	B-Operating_System
and	O
H.264	B-Application
are	O
only	O
licensed	O
for	O
the	O
"	O
personal	O
and	O
non-commercial	O
use	O
of	O
a	O
consumer	O
"	O
.	O
</s>
<s>
Silverlight	B-Application
makes	O
it	O
possible	O
to	O
dynamically	O
load	O
Extensible	B-Protocol
Markup	I-Protocol
Language	I-Protocol
(	O
XML	B-Protocol
)	O
content	O
that	O
can	O
be	O
manipulated	O
through	O
a	O
Document	B-General_Concept
Object	I-General_Concept
Model	I-General_Concept
(	O
DOM	B-General_Concept
)	O
interface	O
,	O
a	O
technique	O
that	O
is	O
consistent	O
with	O
conventional	O
Ajax	B-General_Concept
techniques	O
.	O
</s>
<s>
Silverlight	B-Application
exposes	O
a	O
Downloader	O
object	O
which	O
can	O
be	O
used	O
to	O
download	O
content	O
,	O
like	O
scripts	O
,	O
media	O
assets	O
,	O
or	O
other	O
data	O
,	O
as	O
may	O
be	O
required	O
by	O
the	O
application	O
.	O
</s>
<s>
With	O
version	O
2	O
,	O
the	O
programming	O
logic	O
can	O
be	O
written	O
in	O
any	O
.NET	B-Language
language	I-Language
,	O
including	O
some	O
nuclear	O
evolution	O
of	O
common	O
dynamic	B-Language
programming	I-Language
languages	I-Language
like	O
IronRuby	B-Language
and	O
IronPython	B-Application
.	O
</s>
<s>
A	O
free	B-Application
software	I-Application
implementation	O
(	O
now	O
abandoned	O
)	O
named	O
Moonlight	B-Language
,	O
developed	O
by	O
Novell	O
in	O
cooperation	O
with	O
Microsoft	O
,	O
was	O
released	O
to	O
bring	O
Silverlight	B-Application
version	O
1	O
and	O
2	O
functionality	O
to	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
and	O
other	O
open	B-Application
source	I-Application
platforms	I-Application
,	O
although	O
some	O
Linux	B-Application
distributions	O
did	O
not	O
include	O
it	O
,	O
citing	O
redistribution	O
and	O
patent	O
concerns	O
.	O
</s>
<s>
However	O
,	O
in	O
May	O
2012	O
,	O
Moonlight	B-Language
was	O
abandoned	O
because	O
of	O
its	O
lack	O
of	O
popularity	O
.	O
</s>
<s>
It	O
is	O
compatible	O
with	O
later	O
versions	O
of	O
Internet	B-Application
Explorer	I-Application
web	O
browser	O
on	O
Microsoft	B-Application
Windows	I-Application
(	O
except	O
Windows	B-Operating_System
RT	I-Operating_System
)	O
operating	B-General_Concept
systems	I-General_Concept
,	O
with	O
Safari	B-Application
on	O
Apple	O
macOS	B-Application
,	O
and	O
with	O
mobile	O
devices	O
using	O
the	O
Windows	B-Operating_System
Mobile	I-Operating_System
and	O
Symbian	B-Operating_System
(	O
Series	B-Language
60	I-Language
)	O
platforms	O
.	O
</s>
<s>
Cross-platform	O
Mozilla	B-Application
Firefox	I-Application
support	O
for	O
Silverlight	B-Application
was	O
removed	O
in	O
Firefox	B-Application
52	O
released	O
in	O
March	O
2017	O
when	O
Mozilla	O
removed	O
support	O
for	O
NPAPI	B-Protocol
plugins	O
,	O
bringing	O
it	O
in-line	O
with	O
the	O
removal	O
of	O
NPAPI	B-Protocol
plugin	O
support	O
in	O
Google	B-Application
Chrome	I-Application
.	O
</s>
<s>
Silverlight	B-Application
requires	O
an	O
x86	B-Operating_System
processor	O
with	O
Streaming	B-General_Concept
SIMD	I-General_Concept
Extensions	I-General_Concept
(	O
SSE	O
)	O
support	O
.	O
</s>
<s>
Supported	O
processors	O
include	O
the	O
Intel	B-General_Concept
Pentium	I-General_Concept
III	I-General_Concept
and	O
up	O
,	O
the	O
AMD	O
Athlon	O
XP	O
and	O
up	O
,	O
and	O
newer	O
AMD	O
Durons	O
.	O
</s>
<s>
The	O
following	O
table	O
presents	O
an	O
availability	O
and	O
compatibility	O
matrix	O
of	O
Silverlight	B-Application
versions	O
for	O
various	O
operating	B-General_Concept
systems	I-General_Concept
and	O
web	O
browsers	O
.	O
</s>
<s>
Support	O
for	O
Opera	B-Application
had	O
been	O
promised	O
since	O
May	O
3	O
,	O
2007	O
,	O
when	O
David	O
Storey	O
,	O
the	O
Chief	O
Web	O
Opener	O
at	O
Opera	B-Application
,	O
revealed	O
a	O
Microsoft	O
poster	O
for	O
MIX	O
conference	O
that	O
had	O
shown	O
Opera	B-Application
integration	O
as	O
a	O
part	O
of	O
Silverlight	B-Application
1.1	O
.	O
</s>
<s>
However	O
,	O
Opera	B-Application
was	O
never	O
officially	O
supported	O
by	O
Silverlight	B-Application
.	O
</s>
<s>
On	O
Linux	B-Application
and	O
FreeBSD	B-Operating_System
,	O
the	O
functionality	O
was	O
available	O
via	O
Moonlight	B-Language
and	O
Pipelight	B-Application
,	O
though	O
both	O
projects	O
have	O
since	O
been	O
discontinued	O
.	O
</s>
<s>
Moonlight	B-Language
is	O
available	O
for	O
the	O
major	O
Linux	B-Application
distributions	O
,	O
with	O
support	O
for	O
Firefox	B-Application
,	O
Konqueror	B-Application
,	O
and	O
Opera	B-Application
browsers	I-Application
,	O
provided	O
it	O
was	O
obtained	O
through	O
Novell	O
.	O
</s>
<s>
Miguel	O
de	O
Icaza	O
has	O
expressed	O
an	O
interest	O
in	O
working	O
with	O
developers	O
from	O
other	O
operating	B-General_Concept
systems	I-General_Concept
(	O
BSD	O
,	O
Solaris	O
)	O
and	O
other	O
browsers	O
(	O
Konqueror	B-Application
,	O
WebKit	O
and	O
Opera	B-Application
)	O
to	O
ensure	O
that	O
Moonlight	B-Language
works	O
fine	O
on	O
their	O
systems	O
.	O
</s>
<s>
Availability	O
of	O
Moonlight	B-Language
version	O
1.0	O
for	O
FreeBSD	B-Operating_System
was	O
announced	O
in	O
March	O
2009	O
,	O
but	O
has	O
since	O
been	O
reported	O
not	O
to	O
actually	O
work	O
.	O
</s>
<s>
,	O
the	O
current	O
version	O
of	O
Moonlight	B-Language
(	O
4	O
Preview	O
1	O
)	O
does	O
not	O
officially	O
work	O
on	O
new	O
versions	O
of	O
Firefox	B-Application
(	O
newer	O
than	O
3.x	O
)	O
on	O
Linux-based	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
However	O
,	O
it	O
can	O
be	O
installed	O
in	O
an	O
unofficial	O
way	O
(	O
for	O
example	O
using	O
the	O
add-on	O
)	O
and	O
with	O
Firefox	B-Application
11	O
it	O
works	O
correctly	O
when	O
installed	O
.	O
</s>
<s>
As	O
noted	O
above	O
,	O
the	O
Moonlight	B-Language
project	O
was	O
abandoned	O
in	O
May	O
2012	O
.	O
</s>
<s>
A	O
browser	O
plugin	O
named	O
Pipelight	B-Application
used	O
to	O
provide	O
Silverlight	B-Application
access	O
.	O
</s>
<s>
Pipelight	B-Application
requires	O
browser	O
support	O
for	O
NPAPI	B-Protocol
plugins	O
,	O
which	O
newer	O
versions	O
of	O
Firefox	B-Application
,	O
Chrome	B-Application
,	O
and	O
Opera	B-Application
have	O
dropped	O
.	O
</s>
<s>
As	O
of	O
2018	O
,	O
the	O
Pipelight	B-Application
project	O
has	O
been	O
discontinued	O
.	O
</s>
<s>
Silverlight	B-Application
was	O
not	O
available	O
on	O
Android	B-Application
or	O
iOS	B-Application
,	O
the	O
most	O
prevalent	O
operating	B-General_Concept
systems	I-General_Concept
on	O
the	O
mobile	O
market	O
.	O
</s>
<s>
Silverlight	B-Application
was	O
the	O
primary	O
development	O
environment	O
for	O
Windows	B-Protocol
Phone	I-Protocol
(	O
that	O
is	O
by	O
now	O
discontinued	O
)	O
and	O
is	O
based	O
on	O
Silverlight	B-Application
4	O
.	O
</s>
<s>
For	O
previous	O
versions	O
of	O
Windows	B-Operating_System
Mobile	I-Operating_System
,	O
the	O
first	O
Community	O
Technology	O
Preview	O
(	O
CTP	O
)	O
for	O
Windows	B-Operating_System
Mobile	I-Operating_System
6	I-Operating_System
was	O
expected	O
in	O
the	O
second	O
quarter	O
of	O
2008	O
,	O
but	O
it	O
still	O
has	O
not	O
been	O
officially	O
announced	O
.	O
</s>
<s>
Microsoft	O
has	O
stopped	O
focusing	O
on	O
bringing	O
Silverlight	B-Application
to	O
Windows	O
Mobile	O
6.x	O
.	O
</s>
<s>
Nokia	O
announced	O
plans	O
to	O
make	O
Silverlight	B-Application
for	O
Mobile	O
available	O
for	O
S60	B-Language
on	O
Symbian	B-Operating_System
OS	I-Operating_System
,	O
as	O
well	O
as	O
for	O
Series	B-Operating_System
40	I-Operating_System
devices	O
and	O
Nokia	O
internet	O
tablets	O
(	O
while	O
it	O
later	O
sold	O
the	O
business	O
to	O
Microsoft	O
and	O
now	O
sells	O
Android	B-Application
tablets	O
and	O
will	O
sell	O
Alcatel-Lucent	O
branded	O
smartphones	O
)	O
.	O
</s>
<s>
Silverlight	B-Application
for	O
Mobile	O
supports	O
Silverlight	B-Application
2	O
content	O
and	O
.NET	B-Language
languages	I-Language
.	O
</s>
<s>
Silverlight	B-Application
for	O
Windows	B-Protocol
Phone	I-Protocol
7.5	O
is	O
based	O
on	O
Silverlight	B-Application
4	O
.	O
</s>
<s>
Silverlight	B-Application
applications	O
could	O
be	O
written	O
in	O
any	O
.NET	B-Application
programming	O
language	B-Language
.	O
</s>
<s>
As	O
such	O
,	O
any	O
development	B-Application
tools	I-Application
which	O
can	O
be	O
used	O
with	O
.NET	B-Language
languages	I-Language
can	O
work	O
with	O
Silverlight	B-Application
,	O
provided	O
they	O
can	O
target	O
the	O
Silverlight	B-Application
CoreCLR	O
for	O
hosting	O
the	O
application	O
,	O
instead	O
of	O
the	O
.NET	B-Application
Framework	I-Application
CLR	O
.	O
</s>
<s>
Microsoft	O
has	O
positioned	O
Microsoft	B-Application
Expression	I-Application
Blend	I-Application
as	O
a	O
companion	O
tool	O
to	O
Visual	B-Application
Studio	I-Application
for	O
the	O
design	O
of	O
Silverlight	B-Application
User	B-Application
Interface	I-Application
applications	O
.	O
</s>
<s>
Visual	B-Application
Studio	I-Application
can	O
be	O
used	O
to	O
develop	O
and	O
debug	O
Silverlight	B-Application
applications	O
.	O
</s>
<s>
To	O
create	O
Silverlight	B-Application
projects	O
and	O
let	O
the	O
compiler	O
target	O
CoreCLR	O
,	O
Visual	B-Application
Studio	I-Application
requires	O
the	O
Silverlight	B-Application
Tools	O
for	O
Visual	B-Application
Studio	I-Application
.	O
</s>
<s>
A	O
Silverlight	B-Application
control	O
is	O
a	O
ZIP	O
format	O
file	O
with	O
extension	O
.XAP	O
containing	O
a	O
list	O
of	O
one	O
or	O
more	O
.NET	B-Application
managed	O
assemblies	O
(	O
.DLL	O
files	O
)	O
along	O
with	O
the	O
AppManifest.XAML	O
file	O
containing	O
this	O
list	O
along	O
with	O
the	O
entry	O
point	O
(	O
class	O
and	O
assembly	O
)	O
.	O
</s>
<s>
A	O
Silverlight	B-Application
project	O
contains	O
the	O
and	O
files	O
which	O
initializes	O
the	O
Silverlight	B-Application
plug-in	O
for	O
use	O
in	O
HTML	O
pages	O
,	O
a	O
XAML	B-Device
file	O
for	O
the	O
UI	O
,	O
and	O
code-behind	O
files	O
for	O
the	O
application	O
code	O
.	O
</s>
<s>
Silverlight	B-Application
applications	O
are	O
debugged	O
in	O
a	O
manner	O
similar	O
to	O
ASP.NET	O
applications	O
.	O
</s>
<s>
Visual	B-Application
Studio	I-Application
's	O
CLR	O
Remote	O
Cross	O
Platform	O
Debugging	O
feature	O
can	O
be	O
used	O
to	O
debug	O
Silverlight	B-Application
applications	O
running	O
on	O
a	O
different	O
platform	O
as	O
well	O
.	O
</s>
<s>
In	O
conjunction	O
with	O
the	O
release	O
of	O
Silverlight	B-Application
2	O
,	O
Eclipse	B-Application
was	O
added	O
as	O
a	O
development	O
tool	O
option	O
.	O
</s>
<s>
An	O
April	O
2007	O
PC	O
World	O
report	O
,	O
suggested	O
that	O
Microsoft	O
intended	O
to	O
release	O
certain	O
parts	O
of	O
Silverlight	B-Application
source	O
code	O
as	O
open	B-Application
source	I-Application
software	I-Application
,	O
but	O
a	O
week	O
later	O
Sam	O
Ramji	O
,	O
director	O
of	O
platform	O
technology	O
strategy	O
at	O
Microsoft	O
,	O
contradicted	O
the	O
rumors	O
by	O
confirming	O
that	O
the	O
company	O
had	O
no	O
plans	O
to	O
open	O
Silverlight	B-Application
.	O
</s>
<s>
Some	O
controls	O
that	O
ship	O
with	O
Silverlight	B-Application
are	O
available	O
under	O
the	O
Microsoft	B-License
Public	I-License
License	I-License
as	O
a	O
part	O
of	O
a	O
separate	O
project	O
known	O
as	O
the	O
Silverlight	B-Application
Toolkit	O
.	O
</s>
<s>
Silverlight	B-Application
's	O
proprietary	B-Application
nature	O
is	O
a	O
concern	O
to	O
competition	O
since	O
it	O
may	O
harm	O
the	O
open	O
nature	O
of	O
the	O
World	O
Wide	O
Web	O
.	O
</s>
<s>
Advocates	O
of	O
free	B-Application
software	I-Application
are	O
also	O
concerned	O
Silverlight	B-Application
could	O
be	O
another	O
example	O
of	O
Microsoft	O
's	O
embrace	O
,	O
extend	O
,	O
and	O
extinguish	O
strategy	O
.	O
</s>
<s>
Both	O
Microsoft	B-Application
Silverlight	I-Application
and	O
Adobe	B-Operating_System
Flash	I-Operating_System
are	O
proprietary	B-Application
.	O
</s>
<s>
Flash	O
's	O
file	O
formats	O
are	O
publicly	O
documented	O
standards	O
,	O
as	O
are	O
Silverlight	B-Application
's	O
.	O
</s>
<s>
Silverlight	B-Application
,	O
like	O
other	O
web	O
technologies	O
,	O
uses	O
patent-encumbered	O
audio	O
and	O
video	O
codecs	B-General_Concept
.	O
</s>
<s>
The	O
Mono	B-Application
Team	O
abandoned	O
development	O
of	O
Moonlight	B-Language
,	O
a	O
free	B-Application
and	O
open-source	B-Application
implementation	O
of	O
both	O
the	O
Silverlight	B-Application
1	O
and	O
2	O
runtimes	B-Device
.	O
</s>
<s>
Development	O
was	O
discontinued	O
in	O
2012	O
due	O
to	O
the	O
poor	O
acceptance	O
of	O
Silverlight	B-Application
and	O
the	O
restrictions	O
imposed	O
by	O
Microsoft	O
.	O
</s>
<s>
The	O
project	O
had	O
been	O
officially	O
supported	O
by	O
Microsoft	O
which	O
,	O
under	O
an	O
agreement	O
with	O
Novell	O
,	O
made	O
not-publicly-available	O
additional	O
specifications	O
,	O
access	O
to	O
the	O
Silverlight	B-Application
Base	O
Class	O
Library	O
APIs	O
,	O
binary	O
codecs	B-General_Concept
and	O
test	O
cases	O
available	O
to	O
the	O
Mono	B-Application
team	O
.	O
</s>
<s>
The	O
"	O
covenant	O
"	O
under	O
which	O
Novell	O
was	O
granted	O
this	O
exclusive	O
access	O
also	O
specified	O
conditions	O
incompatible	O
with	O
the	O
licensing	B-License
that	O
covers	O
most	O
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
.	O
</s>
<s>
Some	O
free	B-Application
software	I-Application
proponents	O
criticized	O
the	O
covenant	O
.	O
</s>
<s>
Silverlight	B-Application
was	O
criticized	O
for	O
not	O
living	O
up	O
to	O
its	O
cross-platform	O
operating	B-General_Concept
system	I-General_Concept
compatibility	O
promises	O
,	O
especially	O
on	O
Linux	B-Application
systems	O
,	O
compared	O
to	O
its	O
extensive	O
support	O
on	O
Apple	O
and	O
Microsoft	O
desktops	O
for	O
Internet	B-Application
Explorer	I-Application
,	O
Firefox	B-Application
,	O
and	O
Chrome	B-Application
.	O
</s>
<s>
Although	O
Microsoft	O
was	O
officially	O
collaborating	O
on	O
the	O
Moonlight	B-Language
project	O
,	O
Bruce	O
Chizen	O
,	O
CEO	O
of	O
Adobe	O
Systems	O
,	O
which	O
sells	O
the	O
competing	O
proprietary	B-Application
Flash	B-Operating_System
platform	I-Operating_System
,	O
questioned	O
"	O
the	O
commitment	O
of	O
Microsoft	O
to	O
keep	O
the	O
Silverlight	B-Application
platform	O
compatible	O
with	O
other	O
OS	B-General_Concept
besides	O
Windows	B-Application
"	O
.	O
</s>
<s>
His	O
concerns	O
are	O
based	O
on	O
"	O
examples	O
from	O
history	O
"	O
where	O
he	O
said	O
that	O
Microsoft	O
had	O
launched	O
products	O
with	O
promises	O
of	O
ongoing	O
cross-platform	O
compatibility	O
that	O
no	O
longer	O
apply	O
,	O
for	O
example	O
Internet	B-Protocol
Explorer	I-Protocol
for	I-Protocol
UNIX	I-Protocol
and	O
Windows	B-Device
Media	I-Device
Player	I-Device
for	O
Mac	O
.	O
</s>
<s>
In	O
2007	O
,	O
California	O
and	O
several	O
other	O
U.S.	O
states	O
asked	O
a	O
district	O
judge	O
to	O
extend	O
most	O
of	O
Microsoft	O
's	O
antitrust	O
case	O
settlement	O
for	O
another	O
five	O
years	O
,	O
citing	O
"	O
a	O
number	O
of	O
concerns	O
,	O
including	O
the	O
fear	O
that	O
Microsoft	O
could	O
use	O
the	O
next	B-Device
version	I-Device
of	I-Device
Windows	I-Device
to	O
'	O
tilt	O
the	O
playing	O
field	O
 '	O
toward	O
Silverlight	B-Application
,	O
its	O
new	O
Adobe	B-Operating_System
Flash	I-Operating_System
competitor	O
,	O
"	O
says	O
a	O
Seattle	O
Post-Intelligencer	O
article	O
.	O
</s>
<s>
The	O
final	O
judgment	O
on	O
the	O
motion	O
extended	O
the	O
settlement	O
two	O
years	O
,	O
to	O
November	O
2009	O
,	O
but	O
for	O
reasons	O
unrelated	O
to	O
Silverlight	B-Application
.	O
</s>
<s>
Silverlight	B-Application
1	O
–	O
Silverlight	B-Application
1	O
,	O
developed	O
under	O
the	O
codename	O
Windows	B-Application
Presentation	I-Application
Foundation/Everywhere	I-Application
(	O
WPF/E	B-Application
)	O
was	O
released	O
in	O
2007	O
.	O
</s>
<s>
It	O
consisted	O
of	O
the	O
core	O
presentation	O
framework	O
,	O
which	O
is	O
responsible	O
for	O
the	O
user	B-Application
interface	I-Application
(	O
UI	O
)	O
,	O
interactivity	B-General_Concept
and	O
user	O
input	O
,	O
basic	O
UI	O
controls	O
,	O
graphics	O
and	O
animation	O
,	O
media	O
playback	O
,	O
Digital	O
rights	O
management	O
(	O
DRM	O
)	O
,	O
and	O
DOM	B-General_Concept
integration	O
.	O
</s>
<s>
Silverlight	B-Application
2	O
–	O
Included	O
a	O
version	O
of	O
the	O
.NET	B-Application
Framework	I-Application
and	O
implemented	O
the	O
same	O
full	O
Common	O
Language	B-Language
Runtime	B-Device
(	O
CLR	O
)	O
version	O
as	O
.NET	B-Application
Framework	I-Application
3.0	O
,	O
so	O
it	O
can	O
execute	O
programs	O
written	O
in	O
any	O
.NET	B-Language
language	I-Language
.	O
</s>
<s>
Silverlight	B-Application
3	I-Application
–	O
Silverlight	B-Application
3	I-Application
was	O
announced	O
on	O
September	O
12	O
,	O
2008	O
,	O
and	O
unveiled	O
at	O
MIX09	O
in	O
Las	O
Vegas	O
on	O
March	O
18	O
,	O
2009	O
.	O
</s>
<s>
The	O
final	O
version	O
was	O
released	O
July	O
9	B-Application
,	O
2009	O
.	O
</s>
<s>
Silverlight	B-Application
3	I-Application
included	O
more	O
controls	O
—	O
including	O
DataGrid	O
,	O
TreeView	O
,	O
various	O
layout	O
panels	O
,	O
DataForm	O
for	O
forms-driven	O
applications	O
and	O
DataPager	O
for	O
viewing	O
paginated	O
data	O
.	O
</s>
<s>
Silverlight	B-Application
4	O
–	O
On	O
November	O
18	O
,	O
2009	O
,	O
at	O
the	O
Professional	O
Developers	O
Conference	O
in	O
Los	O
Angeles	O
,	O
Microsoft	O
Corporation	O
unveiled	O
a	O
Beta	O
version	O
of	O
Silverlight	B-Application
4	O
.	O
</s>
<s>
New	O
features	O
in	O
Silverlight	B-Application
4	O
include	O
:	O
support	O
for	O
Google	B-Application
's	I-Application
Chrome	I-Application
browser	O
,	O
webcam	O
and	O
microphone	O
,	O
printing	O
,	O
more	O
mouse	O
support	O
,	O
new	O
notification	O
support	O
to	O
send	O
messages	O
to	O
users	O
,	O
new	O
and	O
enhanced	O
controls	O
(	O
e.g.	O
,	O
RichTextBox	O
,	O
DataGrid	O
)	O
,	O
theming	O
of	O
controls	O
,	O
rendering	O
HTML	O
,	O
better	O
localization	O
,	O
etc	O
.	O
</s>
<s>
Silverlight	B-Application
5	O
–	O
The	O
final	O
version	O
was	O
made	O
available	O
to	O
download	O
on	O
December	O
9	B-Application
,	O
2011	O
.	O
</s>
