<PackageReference Include="System.Security.Permissions" Version="10.0.0-preview.7.25380.108" />

GacInstalled

Confirms that a code assembly originates in the global assembly cache (GAC) as evidence for policy evaluation. This class cannot be inherited.
namespace System.Security.Policy { public sealed class GacInstalled : EvidenceBase, IIdentityPermissionFactory { public object Copy() { return null; } public IPermission CreateIdentityPermission(Evidence evidence) { return null; } public override bool Equals(object o) { return base.Equals(o); } public override int GetHashCode() { return base.GetHashCode(); } public override string ToString() { return base.ToString(); } } }