It depends on the license of the software. Always.
I asked my email-pal: "UNIX or Windoze?". He replied "UNIX". I said "Ah...me too!".
I asked my email-pal: "Linux or AIX?". He said "Linux, of course". I said "Me too".
I asked him: "Emacs or vi". He replied "Emacs". I said "Me too. Small world."
I asked him: "GNU Emacs or XEmacs?", and he said "GNU Emacs". I said "oh, me too."
I asked him "GNU Emacs 19 or GNU Emacs 20"? and he said "GNU Emacs 19". I said "oh, me too."
I asked him, "GNU Emacs 19.29 or GNU Emacs 19.34", and he replied "GNU Emacs 19.29". I said "DIE YOU OBSOLETE NOGOOD SOCIALLY MALADJUSTED CELIBATE COMMIE FASCIST DORK!", and never emailed him again.
From an old slashdot story
This marks an important and symbolic step forward in the battle between Free/Open Source Software and the looming specter of software patent infringements in nations which recognise them. Google's support bolsters the OIN's effectiveness as a shield against patent attacks against GNU/Linux and many popular applications which run on it."Linux plays a vital role at Google, and we're strongly committed to supporting the Linux developer community. We believe that by becoming an Open Invention Network licensee, we can encourage Linux development and foster innovation in a way that benefits everyone. We're proud to participate in OIN's mission to help Linux thrive.