Re:Prior Art? (Score 1)

There is a lot of prior art to this. Take for example, any of the numerous television and cable networks websites. They offer video content, the majority of which is advertiser supported via a what's called a pre-roll ad. While the pre-roll ad is playing all of the video control (play/pause/stop/fast forward, etc) button functionality is disabled.

You can verify this by looking at Comedy Central's Motherload, MTV Overdrive, or the HistoryChannel.com's video players.