保护分发视频的复制和限制观看时间的最佳方法是什么？
我希望在记忆棒（更有可能）或 DVD（不太可能）上发布视频，该视频具有防复制保护并在特定日期后过期。 我们基本上有一个视频，我们想将视频出售给客户，但在行业中，公司交易和复制他们购买的内容是很常见的，甚至是向他们的竞争对手 - 我们正在努力防止这种情况发生。
一些必需/可能的功能：
- 难以复制：视频文件可能已加密，需要特定的视频播放器才能播放
- 48 小时后过期：48 小时后视频无法再播放
- 密钥输入：必须输入密钥才能启动 下可用的时间长度
- 观看并可能包含视频在没有互联网连接的情况
在某些方面，这类似于 Apple iTunes 电影租赁，尽管我们不关心人们从头到尾观看它。 由于大小的原因，我们也不希望通过互联网下载它，尽管这是可能的。
我们可以将视频转换成几乎任何格式。
有哪些现有的解决方案？ 我是一名网络开发人员，所以我不认为我可以开发桌面应用程序。 不过，像 Adobe AIR 这样的东西可以解决这个问题吗？
我还了解到，可能没有一个万无一失的系统可以保证视频永远不会被复制。
我知道这与编程相关，但这可能是程序员经常被问到的问题，无论是在线还是其他方式。
I am looking to release a video on memory stick (more likely) or DVD (less likely) that has protection against duplication and expires after a certain date. We basically have a video we want to sell the video to clients, but in the industry, it's common for companies to trade and duplicate what they have purchased, even to their competitors--we are trying to prevent this.
A few required/possible features:
- difficult to copy: the video file might be encrypted requiring a specific video player to play it
- expires after 48 hours: the video can no longer be played after 48 hours
- key entry: a key must be entered to start watching and may contain the length of the time the video is available for
- needs to work without an internet connection
In some ways this is similar to the Apple iTunes movie rental, although we don't care about people watching it all the way through. We also don't envision it being downloaded over the Internet because of the size, although this is possibility.
We can get the video into pretty much any format.
What pre-existing solutions are there? I am a web developer, so I don't think I could develop a desktop application. Although, would something like Adobe AIR work for this?
I also understand that there probably isn't a fool proof system that will guarantee the video is never duplicated.
I know this is on the edge of programming related, but it's probably something that programmers get asked a lot, either for online or otherwise.
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DRM 在很大程度上是浪费时间。 总是存在模拟漏洞，并且可以解码视频以在无法解码的情况下观看它复制它简直就是一个可笑的原则。 通过使用 DRM，您将永远参与一场徒劳的猫鼠游戏。
DRM is largely a waste of time. There's always the analog hole and making it possible to decode the video to watch it without being able decode it to copy it is simply a ridiculous principle. By using DRM, you'll always be participating in a futile cat and mouse game.
装饰风格。
让每个人都穿着不酷的衣服，装饰俗气（但不复古），配乐很糟糕，比如 80 年代的合成器音乐。
人们不会分发它，并且会在很短的时间后停止观看（也许不是期望的 48 小时......）
Decor.
Put everyone in uncool clothing and have tacky ( but not retro) decor, with an awful soundtrack of say, 80's synthesizer music.
People won't distribute it and will stop watching, after some short time ( maybe not the desired 48 hours...)
许多不同的组织之前已经尝试过整个“过期”的事情。 在我看来，这已被证明在很大程度上是一次失败的实验。
This whole "expiration" thing has been tried before, by many different organizations. In my opinion, it's been proven to be largely a failed experiment.
您需要填补的主要漏洞是尝试让人们不只是在计算机上设置日期以继续观看电影。 如果不需要互联网连接，您就无法验证时间。 除非您想出某种带有内部计时器的定制 USB 记忆棒，该计时器会在一定时间后到期，否则您将无法从用户的计算机上控制此类操作。
另外，我不会假设该文件太大而无法通过互联网传输。 首先，如果他们可以控制解密的流，他们可以将其重新编码为较小的文件格式。 此外，人们已经在互联网上分发蓝光光盘。 我不确定您的格式的具体情况，但我怀疑它比蓝光更大。
The major hole you're going to have to plug is to try to get the person to not just set the date back on their computer to continue viewing the movie. If there's no internet connection required, you can't have a means of verifying the time. Unless you come up with some sort of custom usb stick that has an internal timer, that expires after a certain amount of time, you aren't going to have much luck controlling this sort of thing from the user's computer.
Also, I wouldn't go and assume that the file is too big to be transferring over the internet. Firstly if they can get control of the decrypted stream, they can re-encode it to a smaller file format. Also, people are already distributing blu-ray rips on the internet. I'm not sure of the specifics of your formats, but I doubt it's bigger than blu-ray.
这里最好的方法不是通过编程，而是通过法律保护。
让您提供该视频的每个人都签署一份声明，表示他们不会重新分发该视频（有点（完全）类似于保密协议）。
如果您担心他们仍然会这样做，请在视频中添加某种可识别的水印。
请记住，您的视频是受版权保护的作品。 只需律师即可获得保护（和追回损失）。
The best method here is not through programming but through legal protection.
Make everyone that you give this video sign a release saying that they will not re-distribute the video (kind of (exactly) like an Non-Disclosure Agreement).
If you're concerned that they would still do it, put some sort of identifiable watermark within the video.
Remember, your video is a copyrighted work. Protection (and recovering damages) are only a lawyer away.