How to prevent CAD's delete and copy command?

[chunyuran]

HI, all

     I add some attributions on normal entity, not using cumstom entity.  I want this entity not  to be deleted or copied by CAD's command.

     Or else, when user launch CAD's command, is there any method to switch to my custom delete or copy process?

Any idea?  Thanks a lot.

[Alexander.Rivilis · Accepted solution]

Locking an Entity in AutoCAD using ObjectARX

Disabling copy command for certain entities
Disable certain commands for a given entity or a class in .NET

Enough to start?