防止视频下载
我想知道如何防止其他人下载我网站中的视频。 我的网站可以选择视频上传（flv 或 mp4 格式。管理员将上传它们），用户支付一定金额后可以在线观看课程视频（使用 flowplayer）。
但我观察到用户可以使用 Freecorder 等工具下载这些视频。 我不希望这种情况发生，因为视频的访问受到限制，并且仅限于特定的时间段（直到用户的会员资格到期）。
那么我怎样才能阻止用户下载我网站中的视频呢？
i want to know how can we prevent others to download the videos in my site.
My site has the option of video uploading (in flv or mp4 format. Admin will upload them) and users can view the course videos online (using flowplayer) once they pay some amount.
But what i observed is that the users can download those videos using tools like Freecorder.
I dont want this to happen, because videos have restrictive access and only for a particular period of time (till the user's membership expires).
So how can i prevent the user from being able to download the videos in my site ?
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视频分发的基本规律与 软件许可的基本法。事情是这样的：一旦您将视频放在您无法控制的屏幕上，您就无法再控制视频的分发。
即使您可以阻止他们下载文件，也无法阻止他们将录像机连接到视频卡并重新录制。即使您使用某种受保护路径技术来阻止这种情况，您也无法阻止他们将摄像机对准屏幕。
如果您想保密您的视频，您需要在您控制的剧院中在您控制的屏幕上播放它们，并让有人观看观众的视频录制设备。没有什么比对重新分配产生非常轻微的减缓影响更大的了。
The fundamental law of video distribution is very similar to the fundamental law of software licensing. It goes something like this: Once you put your video on a screen you don't control, you don't have control over distribution of your video any more.
Even if you could stop them from downloading the file, you can't stop them from hooking a VCR to their video card and re-recording it. Even if you use some protected-path technology to stop that, you can't stop them from pointing a camcorder at the screen.
If you want to keep your videos under wraps, you need to show them in a theater under your control on screens you control, and have someone watching the audience for video recording equipment. Nothing else is going to have more than a very slight slowing effect on re-distribution.
这篇文章很旧，但我为防止某些类型的复制所做的是将电影存储在数据库中，并向将它们发送到屏幕的页面添加过期时间以及用户名和密码。
这不会阻止直接录制屏幕，但又是一个有帮助的步骤。
This post is old but what I have done to prevent some types of copying is store the movies in a database and add an expiration and a username and password to the page that send them to the screen.
This will not prevent direct recording of the screen, but it is one more step to help.
流媒体视频文件
如果您想要任何真正级别的保护，您需要使用真正的流媒体服务器。这里的一大优点是文件实际上并没有下载到用户的计算机上——它只是被视为实时流，并且用户的硬盘上没有留下任何文件。
流媒体视频提供了相当好的保护。它将阻止大多数偶然的小偷——只有那些有决心并懂一点技术的人才会继续尝试窃取视频。
窃取流媒体视频最常见的方法是使用视频流捕获工具。这是一个捕获视频流并将其保存为文件的应用程序。这种类型的盗窃非常难以防范。尽管可能存在一些防御，例如拒绝访问已知的捕获设施，但这种级别的防御开始成为一场失败的战斗。一个足够专注于使用流捕获实用程序的小偷可能会不惜一切代价来获取视频。
即使窃贼无法直接捕获流，他们也始终可以使用屏幕捕获实用程序。这是一个捕获屏幕上显示的任何内容的应用程序。他们可以定义某个区域或窗口（即视频屏幕）、播放视频并告诉实用程序捕获它。你确实无能为力来对抗这个问题，但即使你可以……
任何人都可以设置摄像机并将其对准计算机显示器。任何有一些线索的人都可以消除闪烁并获得合理的结果。你绝对没有办法阻止他们这样做。尽管这是一种非常不常见的窃取视频的方式，但这很好地说明了这样一个事实：窃贼总是比网站管理员多一个选择。
Streaming Video Files
If you want any real level of protection you need to use a true streaming server. The big advantage here is that the file is not actually downloaded to the user's computer—it is seen only as a real-time stream and there is no file left on the user's hard drive.
Streaming video provides fairly good protection. It will stop most casual thieves dead—only those with determination and a bit of technical understanding will continue to try and steal the video.
The most common method of stealing streaming video is to use a video stream capture tool. This is an application that captures a video stream and saves it as a file. This type of theft is extremely difficult to guard against. Although there may be some defences, e.g. denying access to known capture utilities, this level of defence starts to become a losing battle. A thief who is dedicated enough to use a stream capture utility is probably dedicated enough to do whatever it takes to get the video.
Even if the thief can't capture the stream directly, they can always use a screen capture utility. This is an application that captures whatever is displayed on screen. They can define a certain area or window (i.e. the video screen), play the video and tell the utility to capture it. There really isn't much you can do to fight this, but even if you could...
Anyone can set up a video camera and point it at a computer monitor. Anyone with a few clues can remove flicker and get a reasonable result. There is absolutely no way you can stop them from doing this. Although it's a very uncommon way to steal video, it's a good illustration of the fact that thieves always have one more option than the webmaster.