Table:
0
A
B
C
D
E
F
1
Protocol
Creator
License
Transport Layer Security
Bulletins to all contacts
Batch file sharing
2
Gadu-Gadu
GG Network
Proprietary
Yes
No
Yes
3
IRC
Jarkko Oikarinen
Open standard
Yes, depending on individual server support
No
No
4
Windows Messenger service
Microsoft
Proprietary (Discontinued)
No
Yes
No
5
MSNP ( Windows Live Messenger , etc.)
Microsoft
Proprietary
No
No
Yes
6
( Mumble )
Thorvald Natvig
Open standard
Yes
No
Yes
7
OSCAR ( AIM , ICQ )
AOL
Proprietary
Yes (Aim Pro, Aim Lite)
No
Yes
8
RVP ( Windows Messenger , etc.)
Microsoft
Proprietary (Discontinued)
No
No
No
9
SIP / SIMPLE
IETF
Open standard
Yes
Yes
Yes
10
Steam Friends
Valve Corporation
Proprietary
Proprietary
Yes
No
11
Skype
Skype
Proprietary
Proprietary
No
Yes
12
TOC2
AOL
Proprietary (Discontinued)
No
No
Partial
13
XMPP / Jingle ( Google Talk )
Jeremie Miller , standardized via IETF
Open standard
Yes
Yes
Yes
14
YMSG ( Yahoo! Messenger )
Yahoo!
Proprietary
No
Yes
Yes
15
Zephyr Notification Service
MIT
Open standard
No
Yes
No

Questions and formulas:
Question: Were there Bulletins to all contacts of the proprietary license created by Microsoft with no transport layer of security?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,(D1="no")*(C1="proprietary")*(B1="microsoft")),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F15,(D2:D15="no")*(C2:C15="proprietary")*(B2:B15="microsoft")),5))
Level: medium
Question: Were there Bulletins to all contacts of the license created by GG Network?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="gg network"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F15,B2:B15="gg network"),5))
Level: medium
Question: What is the name of the license created by IETF?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="ietf"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F15,B2:B15="ietf"),3))
Level: medium