Error Msg: "Source disk is not a dvd movie"

Often when trying to a copy a dvd, I get the message from 1click “Source disk is not a dvd movie”. The disks play fine on my dvd player, some are foreign, but some are domestic, usa. They will not play on my computer. What are they? Is there any way to copy them? These are copy protected, so can not be copied on a dvd recorder alone. Thanks.