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I have a project that needs to play video but not allow downloading.
I'd love to use Flash, but I've seen applications that let you download files from YouTube -- this makes me wonder if Flash isn't that secure.
Must I use Quicktime or Windows Media?
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For web streaming, the best video codec is simple to identify – it is H. 264. H. 264 is hands down the best codec for web streaming because it is highly efficient and compatible with most other forms of video technology you need to use for web streaming.
AES video encryption allows you to prevent these types of attacks completely. Anyone snooping on your streams will be halted by AES encryption. This protects you against piracy, data theft, intellectual property appropriation, and more. Video encryptors help to protect the integrity of your content.
If you send someone the data, there's no way you can stop them from capturing it for later replay. End of story.
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If you want to use Flash then you can secure your media streams using a combination of the RTMPE protocol (it's the 'E' part that's important) and SWF verification. This isn't unbreakable as the data has to be decrypted to play and isn't protected with DRM, but it provides a reasonable deterrent, and is probably sufficient to stop the majority of people trying to use your data.
More security is available with DRM protected media. Adobe have a version that works with Flex but I don't believe it's available for Flash at the moment. Other than that you've got Apple's or Microsoft's implementations, both of which are pretty secure (note that Microsoft have just released their next-generation PlayReady Server SDK for DRM applications).
Determined crackers will get your data no matter what if it's that valuable to them; all you can do is put up enough roadblocks to make it more hassle than it's worth.
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