Why does LibreOffice 5 attempt to contact www.doubleclick.net (a cookie maker) once every minute or so?

Since configuring filters to block the worst offending ‘cookie’ or ‘tracking’ websites like “doubleclick.net” and “googleadservices.com” I’ve noted that the firewall blocks messages from LibreOffice 5 as follows:

OSFW,2016/07/03,13:00:28 -5:00 GMT,UNKNOWN(0),LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,ALLOWED,LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,UNKNOWN(0),LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,ALLOWED,LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,UNKNOWN(0),LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,ALLOWED,LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,UNKNOWN(0),LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,ALLOWED,LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,UNKNOWN(0),LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,ALLOWED,LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,UNKNOWN(0),LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE
OSFW,2016/07/03,13:00:28 -5:00 GMT,ALLOWED,LibreOffice,C:\Program Files\LibreOffice 5\program\soffice.bin,PROCESS,OPENPROCESS,C:\WINDOWS\Explorer.EXE,http://osalerts.zonealarm.com/osanalyze.jsp?Product=ZoneAlarm&ProductVersion=14.1.57.0&HU100=ZLN03771687975450-1001&CL=en&OEM=1003&SKU=0&Mode=6&QSRC=2&OS=Windows+10+x64-10.0.10586--SMP&LANG=2057&PN=LibreOffice&VER=5.1.2.2&FN=soffice.bin&Created=487e9359&Size=677376&MD5=70d80aa6bb7b267b61c31eda9f2d63c4&SKIMP=8122eee22b6f03642be277c7b1c10e94&&CT=6001&EV=1&SUB=1&SEV=3&ARG1=C%3A\WINDOWS\Explorer.EXE

Can anyone tell me why this is happening and how I can stop it?

Many Thanks,

MB

You probably copy & pasted a web page into a Writer document and forgot that it will contact the original server to download graphics and a lot more every time you open it. You should really add infos on what kinds of file triggers this problem.