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I need a primer for both the legacy (Level 1) .NET 2.0 security attributes and the new .NET 4 (Level 2) ones.

I'm not familiar with the implications of controlling LinkDemand, stack walks, unverifiable code and other items in this Patern and Practices guide.

Where can I learn more about this?

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Until someone can point you at a comprehensive resource, you may want to take a look at

For example, it has a article about marking your code transparent (

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