<s>
TeamViewer	B-Language
is	O
a	O
German	O
remote	B-Protocol
access	I-Protocol
and	O
remote	B-Protocol
control	I-Protocol
computer	O
software	O
,	O
allowing	O
maintenance	O
of	O
computers	O
and	O
other	O
devices	O
.	O
</s>
<s>
It	B-General_Concept
was	O
first	O
released	O
in	O
2005	O
,	O
and	O
its	O
functionality	O
has	O
expanded	O
step	O
by	O
step	O
.	O
</s>
<s>
TeamViewer	B-Language
is	O
proprietary	B-Application
software	I-Application
,	O
but	O
does	O
not	O
require	O
registration	O
and	O
is	O
free	O
of	O
charge	O
for	O
non-commercial	O
use	O
.	O
</s>
<s>
It	B-General_Concept
has	O
been	O
installed	O
on	O
more	O
than	O
two	O
billion	O
devices	O
.	O
</s>
<s>
TeamViewer	B-Language
is	O
the	O
core	O
product	O
of	O
developer	O
TeamViewer	B-Language
AG	O
.	O
</s>
<s>
Rossmanith	O
GmbH	O
released	O
the	O
first	O
version	O
of	O
TeamViewer	B-Language
software	O
in	O
2005	O
,	O
at	O
that	O
time	O
still	O
based	O
on	O
the	O
VNC	O
project	O
.	O
</s>
<s>
The	O
IT	B-General_Concept
service	O
provider	O
wanted	O
to	O
avoid	O
unnecessary	O
trips	O
to	O
customers	O
and	O
perform	O
tasks	O
such	O
as	O
installing	O
software	O
remotely	O
.	O
</s>
<s>
The	O
development	O
was	O
very	O
successful	O
and	O
gave	O
rise	O
to	O
TeamViewer	B-Language
GmbH	O
,	O
which	O
today	O
operates	O
as	O
TeamViewer	B-Language
Germany	O
GmbH	O
and	O
is	O
part	O
of	O
TeamViewer	B-Language
AG	O
.	O
</s>
<s>
TeamViewer	B-Language
is	O
available	O
for	O
most	O
desktop	B-Device
computers	I-Device
with	O
common	O
operating	O
systems	O
,	O
including	O
Microsoft	B-Application
Windows	I-Application
and	O
Windows	B-Device
Server	I-Device
,	O
as	O
well	O
as	O
Apple	O
's	O
macOS	B-Application
.	O
</s>
<s>
There	O
are	O
also	O
packages	O
for	O
several	O
Linux	B-Application
distributions	O
and	O
derivatives	O
,	O
for	O
example	O
,	O
Debian	O
,	O
Ubuntu	B-Operating_System
,	O
Red	O
Hat	O
,	O
and	O
Fedora	O
Linux	B-Application
.	O
</s>
<s>
Besides	O
,	O
there	O
is	O
Raspberry	B-Application
Pi	I-Application
OS	I-Application
,	O
a	O
Debian	O
variant	O
for	O
the	O
Raspberry	B-Operating_System
Pi	I-Operating_System
.	O
</s>
<s>
TeamViewer	B-Language
is	O
also	O
available	O
for	O
smartphones	B-Application
and	O
tablets	B-Device
running	O
Android	B-Application
or	O
Apple	O
's	O
iOS/iPadOS	O
operating	O
system	O
,	O
very	O
limited	O
functionality	O
on	O
Linux	B-Application
based	O
operating	O
systems	O
.	O
</s>
<s>
Support	O
for	O
Windows	B-Protocol
Phone	I-Protocol
and	O
Windows	B-Operating_System
Mobile	I-Operating_System
has	O
been	O
phased	O
out	O
after	O
Microsoft	O
discontinued	O
support	O
for	O
the	O
two	O
operating	O
systems	O
.	O
</s>
<s>
The	O
functionality	O
of	O
TeamViewer	B-Language
differs	O
depending	O
on	O
the	O
device	O
and	O
variant	O
or	O
version	O
of	O
the	O
software	O
.	O
</s>
<s>
The	O
core	O
of	O
TeamViewer	B-Language
is	O
remote	B-Protocol
access	I-Protocol
to	O
computers	O
and	O
other	O
endpoints	O
as	O
well	O
as	O
their	O
control	O
and	O
maintenance	O
.	O
</s>
<s>
Besides	O
,	O
some	O
functions	O
facilitate	O
team	O
collaboration	B-Application
,	O
such	O
as	O
audio	O
and	O
video	O
transmissions	O
via	O
IP	B-Application
telephony	I-Application
.	O
</s>
<s>
For	O
this	O
purpose	O
,	O
the	O
enterprise	O
variant	O
TeamViewer	B-Language
Tensor	O
was	O
developed	O
.	O
</s>
<s>
With	O
TeamViewer	B-Language
Pilot	O
,	O
TeamViewer	B-Language
sells	O
software	O
for	O
remote	O
support	O
with	O
augmented	B-General_Concept
reality	I-General_Concept
elements	O
.	O
</s>
<s>
TeamViewer	B-Language
offers	O
interfaces	O
to	O
other	O
applications	O
and	O
services	O
,	O
for	O
example	O
from	O
Microsoft	O
(	O
Teams	O
)	O
,	O
Salesforce	B-Application
,	O
and	O
ServiceNow	B-General_Concept
.	O
</s>
<s>
Private	O
users	O
who	O
use	O
TeamViewer	B-Language
for	O
non-commercial	O
purposes	O
may	O
use	O
the	O
software	O
free	O
of	O
charge	O
.	O
</s>
<s>
A	O
one-time	O
purchase	O
of	O
the	O
application	B-Application
is	O
no	O
longer	O
possible	O
since	O
the	O
switch	O
from	O
a	O
license	O
to	O
an	O
annual	O
subscription	O
model	O
.	O
</s>
<s>
Linus	O
Sebastian	O
,	O
a	O
Canadian	O
YouTube	O
and	O
businessman	O
,	O
documenting	O
how	O
TeamViewer	B-Language
was	O
contacting	O
him	O
at	O
'	O
unsociable	O
hours	O
 '	O
to	O
try	O
to	O
have	O
him	O
convert	O
his	O
perpetual	O
license	O
to	O
the	O
subscription	O
license	O
.	O
</s>
<s>
For	O
cancellation	O
of	O
the	O
annual	O
subscriptions	O
,	O
it	B-General_Concept
must	O
be	O
done	O
within	O
28	O
days	O
of	O
subscribing	O
to	O
the	O
service	O
or	O
upon	O
the	O
renewal	O
of	O
the	O
license	O
.	O
</s>
<s>
This	O
was	O
also	O
separately	O
challenged	O
in	O
California	O
 '	O
courts	O
,	O
which	O
found	O
that	O
TeamViewer	B-Language
's	O
disclosure	O
,	O
seeking	O
consent	O
,	O
and	O
acknowledgement	O
of	O
the	O
auto-renewal	O
to	O
be	O
sufficient	O
,	O
thus	O
legal	O
.	O
</s>
<s>
If	O
desired	O
,	O
TeamViewer	B-Language
can	O
run	O
as	O
a	O
Windows	B-Application
system	O
service	O
,	O
which	O
allows	O
unattended	O
access	O
via	O
TeamViewer	B-Language
.	O
</s>
<s>
There	O
is	O
also	O
a	O
portable	B-Application
version	I-Application
of	O
the	O
software	O
that	O
runs	O
completely	O
without	O
installation	O
,	O
for	O
example	O
via	O
a	O
USB	B-Protocol
data	O
carrier	O
.	O
</s>
<s>
Before	O
each	O
connection	O
,	O
the	O
TeamViewer	B-Language
network	O
servers	O
check	O
the	O
validity	O
of	O
the	O
IDs	O
of	O
both	O
endpoints	O
.	O
</s>
<s>
Security	O
is	O
enhanced	O
by	O
the	O
fingerprint	B-Algorithm
,	O
which	O
allows	O
users	O
to	O
provide	O
additional	O
proof	O
of	O
the	O
remote	O
device	O
's	O
identity	O
.	O
</s>
<s>
TeamViewer	B-Language
provides	O
additional	O
security	O
features	O
,	O
such	O
as	O
two-factor	O
authentication	O
,	O
block	O
and	O
allow	O
lists	O
.	O
</s>
<s>
Before	O
establishing	O
a	O
connection	O
,	O
TeamViewer	B-Language
first	O
checks	O
the	O
configuration	O
of	O
the	O
device	O
and	O
the	O
network	O
to	O
detect	O
restrictions	O
imposed	O
by	O
firewalls	O
and	O
other	O
security	O
systems	O
.	O
</s>
<s>
Usually	O
,	O
a	O
direct	O
TCP/UDP	O
connection	O
can	O
be	O
established	O
so	O
that	O
no	O
additional	O
ports	O
need	O
to	O
be	O
opened	O
.	O
</s>
<s>
Otherwise	O
,	O
TeamViewer	B-Language
falls	O
back	O
on	O
other	O
paths	O
such	O
as	O
an	O
HTTP	B-Protocol
tunnel	I-Protocol
.	O
</s>
<s>
TeamViewer	B-Language
includes	O
end-to-end	O
encryption	O
based	O
on	O
RSA	B-Architecture
(	O
4096	O
bits	O
)	O
and	O
AES	B-Algorithm
(	O
256	O
bits	O
)	O
.	O
</s>
<s>
TeamViewer	B-Language
and	O
similar	O
programs	O
can	O
be	O
abused	O
for	O
technical	O
support	O
scams	O
.	O
</s>
<s>
TeamViewer	B-Language
condemns	O
all	O
forms	O
of	O
misuse	O
of	O
the	O
software	O
,	O
provides	O
tips	O
for	O
safe	O
use	O
,	O
and	O
provides	O
a	O
way	O
to	O
investigate	O
corresponding	O
incidents	O
.	O
</s>
<s>
In	O
June	O
2016	O
,	O
hundreds	O
of	O
TeamViewer	B-Language
users	O
reported	O
having	O
their	O
computers	O
accessed	O
by	O
an	O
unauthorized	O
address	O
in	O
China	O
and	O
bank	O
accounts	O
misappropriated	O
.	O
</s>
<s>
TeamViewer	B-Language
attributed	O
the	O
outcome	O
to	O
user	O
's	O
"	O
careless	O
password	O
use	O
"	O
and	O
denied	O
all	O
responsibility	O
,	O
saying	O
"	O
neither	O
was	O
TeamViewer	B-Language
hacked	O
nor	O
is	O
there	O
a	O
security	O
hole	O
,	O
TeamViewer	B-Language
is	O
safe	O
to	O
use	O
and	O
has	O
proper	O
security	O
measures	O
in	O
place	O
.	O
</s>
