I have a project that needs to be played, but it is not allowed to download.
I like the flash, but I have seen applications that allow you to download files from YouTube - this makes me wonder if the flash is not secure.
Must I Quicktime or Windows Media?
If you want to use Flash, then you can secure your media stream using a combination of RTMPE The protocol (this is the 'e' part which is important) and it is not unbreakable because the data is decrypted to decrypt and is not safe with DRM, but it provides a proper deterrent, and possibly your Most of the data trying to use data Enough is enough to stop people.
More security is available with DRM protected media. Adobe has a version that works with Flex, but I believe this time is not available for Flash. Apart from this, you have got the implementation of Apple or Microsoft, both of which are quite secure (note that Microsoft has yet released its next-generation PlayReady server SDK for DRM applications).
The determined cracker does not matter whether your data is important to them;