#### 3.4.2.2. Other Variables Related to Commercial Licenses

Other helpful variables related to commercial license handling exist and are defined in the `$HOME/poky/meta/conf/distro/include/default-distrovars.inc` file:

         COMMERCIAL_AUDIO_PLUGINS ?= ""
         COMMERCIAL_VIDEO_PLUGINS ?= ""
         COMMERCIAL_QT = ""

If you want to enable these components, you can do so by making sure you have the following statements in your `local.conf` configuration file:

         COMMERCIAL_AUDIO_PLUGINS = "gst-plugins-ugly-mad \
            gst-plugins-ugly-mpegaudioparse"
         COMMERCIAL_VIDEO_PLUGINS = "gst-plugins-ugly-mpeg2dec \
            gst-plugins-ugly-mpegstream gst-plugins-bad-mpegvideoparse"
         COMMERCIAL_QT ?= "qmmp"
         LICENSE_FLAGS_WHITELIST = "commercial_gst-plugins-ugly commercial_gst-plugins-bad commercial_qmmp"

Of course, you could also create a matching whitelist for those components using the more general "commercial" in the whitelist, but that would also enable all the other packages with `LICENSE_FLAGS` containing "commercial", which you may or may not want:

         LICENSE_FLAGS_WHITELIST = "commercial"

Specifying audio and video plug-ins as part of the `COMMERCIAL_AUDIO_PLUGINS` and `COMMERCIAL_VIDEO_PLUGINS` statements or commercial qt components as part of the `COMMERCIAL_QT` statement (along with the enabling `LICENSE_FLAGS_WHITELIST`) includes the plug-ins or components into built images, thus adding support for media formats or components.