Abstract: This invention relates to attaching or relating a unique identifier of an importing/screening device to content material during import from a non-compliant domain into a compliant domain. In this way, it is always possible to identify the importing device for a given content material. A list comprising unique identifiers for importing devices that has been determined to import content material illegally may then be used in devices, applications, systems, etc. for the using content material in such a way that the use may be prohibited for content material being imported in to the compliant domain by devices, applications, systems, etc. that has been determined to import content material illegally. This allows for the revocation of use of content material in the compliant domain that has been imported there byan importing/screening device that has been determined to illegally import content material.