Login page modification and license

[amatsuda]

I would like to change login page for something like on attachment in Open Source version. Can I do this? If I can what is the simplest way to do it in all skins?

In some skins like carbon there are uncomment lines in third section (where is something about commercial). Can I use this skin in Open Source?

# Logo Licensing Rules #
#------------------------------------------------------------------------#
# If you are using the Zimbra Collaboration Suite (ZCS) under the
# open source license, and you have not modifed the software,
# then you are required to use the Zimbra logo (the default).
#
# LogoImgDir = @AppContextPath@/skins/_base/logos
# LogoURL = Zimbra offers Open Source email server software and shared calendar for Linux and the Mac.
#
#-------------------------------------------------------------------------
# If you are using ZCS under the open source license,
# and you have modified the software,
# then you are required to use the Zimbra Inside logo.
#
# LogoImgDir = @AppContextPath@/skins/_base/logos/ZimbraInside
# LogoURL = Zimbra offers Open Source email server software and shared calendar for Linux and the Mac.
#
#-------------------------------------------------------------------------
# If you are using ZCS under the network (commercial) license,
# then you are welcome to use your own logo in place of the Zimbra logo,
# or to retain the original Zimbra logo.
#
LogoImgDir = @AppContextPath@/skins/carbon/logos
LogoURL = http://www.vmware.com/products/zimbra/
#
#================================================= ========