<PackageReference Include="System.Security.Permissions" Version="10.0.0-rc.2.25502.107" />

System.Transactions.DistributedTransactionPermissionAttribute

Allows security actions for DistributedTransactionPermission to be applied to code using declarative security. This class cannot be inherited.
namespace System.Transactions { public sealed class DistributedTransactionPermissionAttribute : CodeAccessSecurityAttribute { public new bool Unrestricted { get; set; } public DistributedTransactionPermissionAttribute(SecurityAction action); } }