<PackageReference Include="System.Security.Permissions" Version="11.0.0-preview.2.26159.112" />

System.Security.Policy.NetCodeGroup

public sealed class NetCodeGroup : CodeGroup
Grants Web permission to the site from which the assembly was downloaded. This class cannot be inherited.
namespace System.Security.Policy { public sealed class NetCodeGroup : CodeGroup { public static readonly string AbsentOriginScheme; public static readonly string AnyOtherOriginScheme; public NetCodeGroup(IMembershipCondition membershipCondition); public void AddConnectAccess(string originScheme, CodeConnectAccess connectAccess); public DictionaryEntry[] GetConnectAccessRules(); public void ResetConnectAccess(); } }