SecurityTreatAsSafeAttribute.cs

namespace System.Security
{
    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Enum | AttributeTargets.Constructor | AttributeTargets.Method | AttributeTargets.Field | AttributeTargets.Interface | AttributeTargets.Delegate, AllowMultiple = false, Inherited = false)]
    [Obsolete("SecurityTreatAsSafe is only used for .NET 2.0 transparency compatibility.  Please use the SecuritySafeCriticalAttribute instead.")]
    public sealed class SecurityTreatAsSafeAttribute : Attribute
    {
    }
}