This example assumes a default ALLOW policy.
To block the YouTube video, use the following local policy (or the equivalent VPM policy):
This policy uses the unique identifier string of the video that follows the
v= and blocks that substring from playing, as well as the background YouTube video URLs that are retrieved for the video.
Do not set the following URLs to DENY:
NOTE: This CPL has been tested on Internet Explorer 8 and 9 and Firefox 11.0, and it appears to be working as expected.