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Hello, <br />
<br />
I want to protect audio files but I want to make a similar system to DRM where the user downloads a file and then has to Activate it by entering a username and password. A encryption key is then downloaded to the clients computer. The client can then decrypt the files.<br />
<br />
The question I have is what stops one sharing his downloaded key with all his friends? With DRM you must download a new key on each computer. How does this work?<br />
<br />
Thanks
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Hello, 

I want to protect audio files but I want to make a similar system to DRM where the user downloads a file and then has to Activate it by entering a username and password. A encryption key is then downloaded to the clients computer. The client can then decrypt the files.

The question I have is what stops one sharing his downloaded key with all his friends? With DRM you must download a new key on each computer. How does this work?

Thanks

How does DRM style encryption work, want to create a similar system.

Digital audio is technology that can be used to record, store, generate, manipulate, and reproduce sound using audio signals encoded in digital form. Following significant advances in technology, digital rapidly replaced analog audio technology in most areas. Digital audio systems may include compression, storage, processing and transmission components. It is important to distinguish between the audio coding format, the codec performing the encoding and decoding of the raw audio data, and the container file. Common file formats include .wav, .aiff, .au, .m4a, .mp3, .wma, .ra and .raw.

Digital Audio

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.

Encryption

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).