Problemas de seguridad en creación de assemblies

[seth444]

Hola gente,

Mi problema es que tengo un assembly que únicamente hace operaciones internas, destro de la base de datos en la que está metido, es decir, no accede a disco, ni al registro ni externamente a ningún sitio. Sin embargo, cuando intento utilizarlo me da un error como este:

A .NET Framework error occurred during execution of user-defined routine or aggregate "GetXaml": System.Security.HostProtectionException: Attempted to perform an operation that was forbidden by the CLR host. The protected resources (only available with full trust) were: All The demanded resources were: ExternalThreading System.Security.HostProtectionException: at System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Assembly asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, SecurityAction action, Object demand, IPermission permThatFailed) at System.Security.CodeAccessSecurityEngine.CheckSetHelper(PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandle rmh, Object assemblyOrString, SecurityAction action, Boolean throwException) at System.Security.CodeAccessSecurityEngine.CheckSetHelper(CompressedStack cs, PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandle rmh, Assembly asm, SecurityAction action) at Preference.Jitmv.XamlProcessor.ProcessXamlTemplate() at Preference.Jitmv.SqlServer.Processor.GetXaml(SqlXml
xmlDescriptive, SqlXml xmlPrice, SqlString templateName, SqlInt16 language, SqlInt32 instanceQuantity) .


Este error lo soluciono ÚNICAMENTE dándole un conjunto de permisos "UNSAFE" al assembly. ¿Alguien sabe porqué narices (con perdón) no puedo usar el "SAFE" ó "EXTERNAL_ACCESS" si no tiene nigún tipo de acceso externo a recursos?.

Gracias y perdonar las molestias.