Apple HTML5 渐进式流媒体
使用渐进式 http 下载（Apple 分段）时，是否存在保存到 ipad/ipod 的文件副本，用户可能可以从设备上复制该副本？
意思是，从内容保护角度来看，这种情况是否被认为是“安全”的： 1. 用户访问付费专区提供电影的网站 2. 用户选择要在线观看的电影（渐进式下载或“伪流式传输”） 3. 片段通过 html5 视频标签无缝下载为 .m3u8 的一部分 4. 电影播放/结束。
设备上是否有可以转移的这部电影的完整副本？有人知道苹果对此的立场吗？
Is there a copy of the file saved to the ipad/ipod when using progressive http download (apple segmented) that the user could potentially copy off the device?
meaning, is this scenario considered 'safe' from a content protection pov:
1. user comes to websites with movies behind paywall
2. user selects a movie to watch online (progressively downloaded or 'pseudo-streamed')
3. segments are downloaded seamlessly by html5 video tag as part of .m3u8
4. movie plays/ends.
is there any full copy of this movie on the device that can be transferred off? anyone know apple's stance on this?
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我不太担心人们从某些隐藏的缓存中获取文件，而更担心您拥有一个允许将文件直接下载到任何设备上的http URL。
您可以绕过这个问题并检查用户代理字符串、会话 cookie 等，但是您无法做太多事情来阻止某人弄清楚它并编写一个简单的方法来解决它。
I'd worry less about people obtaining the files from some hidden-away cache, and more about the fact you've got an http URL which allows the file to be directly downloaded onto any device.
You can dance around this and check for user-agent strings, session cookies etc, but there's not much you can do prevent someone from figuring it out, and writing an easy way around it.
我相信您可以使用 mediafilesegmenter 进行分段，使得文件只能从在线位置查看。我可能是错的，但如果你查看 mediafilesegmenter 文档，似乎有很多安全选项。那就是我要看的地方。
I believe you can segment using mediafilesegmenter in such a way that the files can only be viewed from the online location. I could be wrong about that, but if you check out the mediafilesegmenter docs, there appears to be many security options. That's where I'd look.