[YouTube-API] Change permissions after upload

Am trying to use the Zend PHP library to change the permissions of a
video or number of videos after uploading. Would like to be able to
turn off "rate", "comment", "commentVote", "videoRespond", "embed" and
"syndicate" but although I'm not getting any errors, the permissions
are not being changed. Having authenticated (which I know is working
since I can upload), this is the code I'm trying:

$videoFeed=$yt->getuserUploads('my username'); # all videos in our
Channel
$actions = array("rate", "comment", "commentVote", "videoRespond",
"embed", "syndicate");
foreach ($videoFeed as $videoEntry) {
foreach($actions as $action) {
echo "<li> setting '".$action."' for video ".$videoEntry-
>getVideoId()."</li>\n";
$accessControlElement = new
Zend_Gdata_App_Extension_Element('yt:accessControl', 'yt', 'http://
gdata.youtube.com/schemas/2007', '');
$accessControlElement->extensionAttributes = array(
array(
'namespaceUri' => '',
'name' => 'action',
'value' => '$action'),
array('namespaceUri' => '',
'name' => 'permission',
'value' => 'denied')
);
$videoEntry->extensionElements = array($accessControlElement); #
apply the setting to this video
}
}

PHP is 5.3.0, Zend is version 1.11.4 Release (r23791). Any ideas?

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