Can I start playing encrypted content in the middle?

I have encrypted several contents using the methods SDK provided. But when I start playing the encrypted content(in f4v and flv format both), I found a problem. That is I can only play the video from the very beginning.Is there a way to play whatever part I want?

Thank you almost, I am confused that how can I seek the playing video with my browser like youtube. I found that I can only play the downloaded part and I must wait the browser to download the video slowly, Is there a way to solve that problem? Maybe it likes that when I seek a moment to play, then the browser send a new request to the server, and start to download from that moment.
Thanks.

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