Question: Who bought-out the software company who 's version management software was used by Lockheed Martin and Verizon Wireless ?

text: Comparison of version-control software
History and adoption
Table explanation Software : The name of the application that is described . History : briefly describes the software 's origins and development . Notable users : is a list of well known projects using the software as their primary revision control system , excluding the software itself , followed by a link to a full list if available .
The following is a comparison of version-control software. The following tables include general and technical information on notable version control and software configuration management (SCM) software. For SCM software not suitable for source code, see Comparison of open-source configuration-management software.
Software History Notable users
AccuRev SCM First publicly released in 2002 American Airlines , Ford , Lockheed Martin , Orbitz , Xerox , McAfee , Polycom , SanDisk , Siemens , Sony , Symantec , Thomson Financial , Verizon Wireless and many others
Azure DevOps Server First publicly released in March , 2006 as Visual Studio Team System , renamed to Team Foundation Server in 2010 and Azure DevOps Server in 2019 Microsoft
Azure DevOps Services First publicly released in 2012 as Team Foundation Service , renamed to Visual Studio Online in 2013 , Visual Studio Team Services in 2015 and Azure DevOps in 2018 Microsoft
GNU Bazaar Initial release March 26 , 2005 . Loosely related to baz . Sponsored by Canonical Ltd . Ubuntu , Launchpad , KatchTV ,
BitKeeper Initial release May 4 , 2000 . Influenced by Sun WorkShop TeamWare Linux Kernel ( 2002-2005 ) and many companies
CA Software Change Manager Original company founded in 1977 ; CA SCM ( then called CCC/Harvest ) first released in 1995 CA does not disclose customer lists without the companies ' permission . CA SCM is used by companies with global development teams including 13 of the Fortune 100
ClearCase Developed beginning in 1990 by Atria Software , following concepts developed by Apollo Computer in DSEE during the 1980s . The most recent version is 9.0.0 , released in March 2016 IBM , Alcatel-Lucent , Cisco , Motorola , Siemens , Ericsson , Nokia , Society for Worldwide Interbank Financial Telecommunication and other large organizations worldwide
Code Co-op The first distributed VCS , demoed in 1997 , released soon after
CVS First publicly released July 3 , 1986 ; based on RCS NetBSD , OpenBSD
CVSNT First publicly released 1998 ; based on CVS . Started by CVS developers with the goal adding support for a wider range of development methods and processes Primarily professionals ( not hobbyists ) , e.g . : AnandTech , Wachovia , Wells Fargo , Goldman Sachs
darcs First announced on April 9 , 2003 Mnet , xmonad , Projects Using Darcs
Dimensions CM Developed by SQL Software under the name PCMS Dimensions during the late 1980s ( PCMS standing for Product Configuration Management ) . Through number of company acquisitions the product was released under names PVCS Dimensions ( 1990s , Intersolv ) , Dimensions ( early 2000s , Merant ) , ChangeMan Dimensions ( 2004 , Serena Software ) and finally Dimensions CM ( since 2007 , Serena Software ) Lockheed Martin , European Space Agency , Fujitsu Business Communication Systems and many companies worldwide
Fossil Fossil and SQLite have used Fossil since 21 July 2007 SQLite , Tcl/Tk Project
Git Started by Linus Torvalds in April 2005 , following the BitKeeper controversy Linux kernel , Android , Bugzilla , DragonFly BSD , GNOME , GNU Emacs , GRUB2 , KDE , MySQL , Perl 5 , PostgreSQL , X.Org , Cairo , Qt Development Frameworks , Samba , OpenEmbedded , Ruby , Ruby on Rails , Wine , Fluxbox , Openbox , Compiz Fusion , XCB , ELinks , XMMS2 , e2fsprogs , GNU Core Utilities , DokuWiki , Drupal , LibreOffice , MediaWiki , Mono , ASP.NET MVC , ADO.NET Entity Framework , NuGet , jQuery and many of its plugins , OpenCV , Wireshark , Django , many companies like Ericsson , Microsoft , Huawei , Apple , Amazon , LG
GNU arch Started by Tom Lord in 2001 , it later became part of the GNU project . Lord resigned as maintainer in August 2005 available for GNU Savannah and Gna.org projects
IC Manage Developed by IC Manage , Inc which was founded in 2003 by Shiv Sikand and Dean Drako many organizations worldwide
PTC Integrity Originally developed by MKS Software . Purchased by PTC in May 2011 Many global engineering and IT organizations
Mercurial Started April 6 , 2005 by Matt Mackall , following the BitKeeper controversy . First released on April 19 , 2005 Python , Mozilla , OpenJDK , NetBeans , Xine , Xen , OpenSolaris , wmii , MoinMoin , Linux-HA , Pidgin , Gajim , Nginx , PyPy , SDL , Facebook , Google ( as a UI on top of Piper )
Monotone First released in April 2003 CTWM , I2P , Botan
Perforce Helix Core Developed by Perforce Software , Inc which was founded in 1995 by Christopher Seiwald FreeBSD , Scania AB