Read Only Seekbar Issues

Hello all! I know this topic has been discussed, but am hoping someone has been able to figure a way to get around my problem. I produce continuing ed courses that have timing requirements set by individual jurisdictions, so need to leave the seek bar at read only, forcing the learner to view the entire presentation. Since the material is very content dense, I am trying to figure a way to allow learners to back up and move around in already viewed portions without having the ability to jump forward. The slides are a combination of a video with many layers and hotspots, making things pretty complicated. Video controls are a no, variables don't work if the seekbar is draggable....any ideas?

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