Are there limitations when using unsafe code in .NET?

I see the allow unsafe code option in .NET. Only one of my apps have it set so i can copy an image to a bitmap quickly.

Will there be limitations now that i checked off that box? mono seems to run it fine on linux. I do开发者_StackOverflow中文版nt see any problems so far.

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A possible limitation is that your code can run only in full trust.