Silverlight 5 WinRT

  public sealed class AspNetHostingPermission
  : CodeAccessPermission, IPermission, ISecurityEncodable, IStackWalk, IUnrestrictedPermission
  public AspNetHostingPermissionLevel Level { get; set; }
  public virtual IPermission Copy();
  public virtual void FromXml(SecurityElement securityElement);
  public virtual IPermission Intersect(IPermission target);
  public virtual Boolean IsSubsetOf(IPermission target);
  public virtual Boolean IsUnrestricted();
  public virtual SecurityElement ToXml();
  public virtual IPermission Union(IPermission target);

  public sealed class AspNetHostingPermissionAttribute
  : CodeAccessSecurityAttribute, _Attribute
  public AspNetHostingPermissionLevel Level { get; set; }
  public virtual IPermission CreatePermission();

  public sealed enum AspNetHostingPermissionLevel
  : IComparable, IFormattable, IConvertible
  { None, Minimal, Low, Medium, High, Unrestricted }