但如果碟片侦测到播放机被改动成能录制，或者用的是从其他播放机偷来的密钥，碟片内容就放不出来。

But if the disc detects that the player has been modified to record the movie, or it is using stolen keys from a different player, the disc won't play.

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你在下一章里要解决的一个内容是如何处理球的物理效果和如何侦测你碰到的是挡板的哪一部分。

One of the problems you will solve in the next part is how to handle the ball physics and how to detect which part of the paddle you hit.

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您可以侦测文件更改日期和内容。

You can detect file changes by date and content.

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