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Why isn't it working in Firefox?

On Firefox, you'll have to convert the mp4 file to OGV format to get it to play in HTML5 video format. See: http://diveintohtml5.info/video.html for more information.

Why isn't it working in IE or Safari?

If your video is not playing in IE 8, then its likely your mp4 file is not in the proper encoding scheme compatible with HTML5 video. It has to be in h.264 format. See: http://diveintohtml5.info/video.html for more information.

How do I secure my videos?

We use the Secure HTML5 Video Player with another plugin, cart66, that handles access to the pages that have the videos. That way, only members can see the videos. Another option is to password protect the post where the video short-tag is used. We personally don't have a problem with them saving the mp4, if they are on a page that they are allowed to be on. For some, it could be a feature.