<PackageReference Include="System.Security.AccessControl" Version="5.0.0-preview.2.20160.6" />

AccessControlModification

Specifies the type of access control modification to perform. This enumeration is used by methods of the ObjectSecurity class and its descendents.
namespace System.Security.AccessControl { public enum AccessControlModification { Add, Set, Reset, Remove, RemoveAll, RemoveSpecific } }