I am using H.264 video codec in my Ubuntu for video editing. But how do i verify it is the openSource H.264? apt-get install x264 i applied, does it installs the Free H.264 or commercial one?.
I think the page you've linked to says it all:
"x264 is a free software library and application for encoding video streams into the H.264/MPEG-4 AVC format, and is released under the terms of the GNU GPL.
Another indicator, x264 is in Universe, which is free, community maintained software. It looks like there is a non-free counterpart, h264enc, in Multiverse.