Abstract: The present invention relates to reproducing a unique identifier (ID) from a record carrier (5), a data which has area for storing data and a defect management area for storing data reallocated from defective sectors and for storing reallocation information. To prevent users from copying the unique identifier a reproduction apparatus is proposed comprising:—a reallocation information reading means (7) for reading reallocation information from said defect management area marking a first predetermined non-defective sector in said data area as defective and as reallocated to a second sector in said defect management area,—a data reading means (6, 8) for reading a first data unit from said first sector and for reading a second data unit from said second sector, and —an evaluation means 10) for evaluating said first data unit and said second data unit by comparison and/or combination to derive said unique identifier(ID).

Abstract: A method of providing a read-only record carrier on which user data can be recorded at predetermined recordable positions of subcode frames of a subcode channel after mastering of said record carrier, includes the steps of setting the subcode symbols at said predetermined recordable positions to a first predetermined symbol value during mastering, calculating, for each subcode frame, error detection data over certain subcode data of said subcode frame including said subcode symbols set to said first predetermined symbol value, storing said error detection data at auxiliary data positions in said subcode frame, and setting error detection data positions in said subcode frame to a second predetermined symbol value, wherein said predetermined recordable positions of said subcode frames are provided for recording of user data to it during writing of data, and said error detection data positions of said subcode frames are provided for recording correct error detection data, calculated after recording said user dat

Abstract: Disclosed is a record carrier, in particular a recordable or rewritable optical disc, having a program memory area for storing administrative data, a lead in area, a program area for storing user data and a lead out area. In order to enable a drive to access digital rights management data which are stored in the program area, comprising e.g. usage rights and cryptographic keys, it is proposed that the record carrier further comprises:—a DRM pointer entry (ALP) comprising the entry point for said digital rights management data is stored in the program area after said digital rights management (DRM) data, —a drive-readable entry comprising an information allowing the drive to find said DRM pointer entry (ALP) and to access said digital rights management (DRM) data is stored in said program area or said program memory area.

Abstract: The invention relates to a method of copy detection of a record carrier. In one particular embodiment the table of content entries are mastered on the record carrier in a detectable non-standard way, e.g. the sequence of table of content entries is mixed or the number of repetitions is varied. According to another embodiment additional synchronization symbols are used in one or more subcode frames which can be detected by a read-out device in order to distinguish between an original or a copy of a record carrier.

Abstract: Catalyst compositions enabling the production of polyalkenes with improved bulk density are prepared by combining the following catalyst components in the following order of addition: first introducing an electron donor component, then adding a reaction product of a di-alkylaluminium halide and a solid component comprising a magnesium di-halide, an electron donor and a halide of tetravalent titanium and lastly adding a tri-alkylaluminium compound.

Abstract: Catalysts compositions enabling the production of polyalkenes with improved bulk density are prepared by combining the following catalyst components in the following order of addition: first introducting an electron donor component, then adding a reaction product of a di-alkylaluminium halide and a solid component comprising a magnesium di-halide, an electron donor and a halide of tetravalent titanium and lastly adding a tri-alkylaluminium compound.