In 2017 / 2018 these Audit Certificates expired and ceased to be used DGS90.cer (also labeled DGS84), DGS91.cer (also labeled DGS83), DGS92.cer, DGS93.cer, DGS100.cer
The timestamp certficates that were issued by those Audit Certificates. The names are based on the Audit Certificate serial number and then the Timestamp Certificate serial number in decimal::

DGS100.32769.cer September 11, 2016 - January 15, 2018

DGS91.32788.cer June 30, 2016 - January 15, 2018

DGS91.32787.cer October 18, 2015 - June 30, 2016

DGS91.32786.cer April 11, 2015 - October 18, 2015

DGS91.32785.cer August 21, 2014 - April 11, 2015

DGS91.32784.cer February 23, 2014 - August 21, 2014

DGS91.32783.cer August 15, 2013 - February 23, 2014

DGS91.32782.cer February 21, 2013 - August 15, 2013

DGS91.32781.cer August 16, 2012 - February 21, 2013

DGS91.32780.cer February 16, 2012 - August 16, 2012

DGS91.32779.cer August 18, 2011 - February 16, 2012

DGS91.32778.cer February 17, 2011 - August 18, 2011

DGS91.32777.cer August 17, 2010 - February 17, 2011

DGS91.32776.cer February 17, 2010 - August 17, 2010

DGS91.32775.cer August 25, 2009 - February 17, 2010

DGS83.32774.cer February 25, 2009 - August 25, 2009

DGS83.32773.cer August 27, 2008 - February 25, 2009

DGS83.32772.cer March 5, 2008 - August 27, 2008

DGS83.32771.cer August 14, 2007 - March 5, 2008

DGS83.32770.cer November 15, 2006 - August 14, 2007

DGS83.32769.cer August 22, 2005 - November 15, 2006

DGS92.32779.cer June 29, 2016 - August 10, 2016

DGS92.32778.cer December 31, 2015 - June 29, 2016

DGS92.32777.cer June 28, 2015 - December 31, 2015

DGS92.32776.cer December 27, 2014 - June 28, 2015

DGS92.32775.cer May 18, 2014 - December 27, 2014

DGS92.32774.cer November 13, 2013 - May 18, 2014

DGS92.32773.cer May 8, 2013 - November 13, 2013

DGS92.32772.cer November 8, 2012 - May 8, 2013

DGS92.32771.cer May 8, 2012 - November 8, 2012

DGS92.32770.cer September 27, 2011 - May 8, 2012

DGS93.32775.cer May 10,2011 - September 26, 2011

DGS93.32774.cer Nov 9, 2010 - May 10, 2011

DGS93.32773.cer May 11, 2010 - Nov 9, 2010

DGS93.32772.cer Nov 11, 2009 - May 11, 2010

DGS90.32775.cer May 18, 2009 - Nov 11, 2009

DGS84.32774.cer Nov 18, 2008 - May 18, 2009

DGS84.32773.cer May 21, 2007 - Nov 18, 2008

DGS84.32772.cer Nov 14, 2007 - May 21, 2008

DGS84.32771.cer Jan 24, 2007 - Nov 14, 2007

DGS84.32770.cer April 13, 2006 - Jan 24, 2007

DGS84.32769.cer July 30, 2005 - April 13, 2006

History of certificates created before the external audit process

Before the external audit process and Issued by certificate DGS82.cer:

DGS82.32768.cer May 22, 2005 - July 30, 2005 12:10 GMT

Before the external audit process and issues directly from the Root CA cert:

DGS68.cer May 2, 2004 - May 22, 2005 12:32 GMT

DGS64.cer May 3, 2003 - May 2, 2004 21:44 GMT

DGS57.cer May 6, 2002 - May 3, 2003 13:05 GMT

DGS45.cer January 21, 2001 - May 6, 2002 16:29 GMT

DGS37.cer October 29, 2000 - January 21, 2001 15:49 GMT

DGS30.cer September 1, 2000 - October 29, 23:00 GMT

DGS27.cer April 12, 2000 - September 1, 2000 21:30 GMT

DGS23.cer March 31, 2000 - April 12, 2000 4:00 AM GMT

DGS69.cer August 1 2004 15:40 to August 22, 2005 12:49 GMT

DGS67.cer August 7 2003 17:29 to August 1, 2004 15:08 GMT

DGS63.cer April 5 13:31 2003 to August 15 16:30 2003 GMT

DGS52.cer April 15, 2002 to April 5, 12:42 2003

DGS46.cer January 21, 2001 to April 15, 2002 GMT

DGS36.cer October 29, 2000 - January 21, 2001 16:02 GMT

DGS32.cer August 19, 2000 - October 29, 2000 17:10 GMT

The root certificate, serial number 44 and 58, were upgraded to support audit process and encoding The previous certificate are still available here: DGSca58.cer (replaced Feb 14 2005) and DGSca44.cer (first used for TSA2 on August 7 2003).

Time-stamp public keys for our IP-Protector application before March 2000 and back to when it was first released in March 1998 are available by writing to support@e-TimeStamp.com (these were not stored in x.509 form).