Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Information carrier containing auxiliary information, reading device and method of manufacturing such an information carrier










Image Number 4 for United States Patent #6031815.

A system for controlled reproduction of information according to the invention comprises an information carrier and a reading device. The information carrier contains information in blocks written in a track. The information carrier has reference patterns which divide the track into sectors for writing the information blocks, and auxiliary information written in the reference patterns. The auxiliary information is related to the information, for example, a decoding key, access code or digital signature. The reading device comprises a demodulation means for recovering both the information and the auxiliary information. The device may include means for processing the information and/or auxiliary information in dependence on the auxiliary information. Since the auxiliary information cannot be transferred to an illegal copy, this copy is unusable.








 
 
  Recently Added Patents
Implementing state-of-the-art gate transistor, sidewall profile/angle control by tuning gate etch process recipe parameters
Processes for producing polyunsaturated fatty acids in transgenic organisms
Signal processor and signal processing method
Polarized film apparatus with bands of alternating orientation
Methods and apparatus for deactivating internal constraint curves when inflating an N-sided patch
Control device with adjusting pulse width modulation function and the backlight module thereof
Scissors
  Randomly Featured Patents
Electronic device enclosure
Developer container, process cartridge, developing device, and image forming apparatus with toner sensor wiping member orientation
Monitoring and feedback wireless medical system and method
Imidazole derivatives for pharmaceutical use
Integrated circuit card with application history list
Touching-type electronic paper and method for manufacturing the same
DNA polymerases having amino acid substitutions and homologs thereof
Semiconductor intergrated circuit device
Method and device for sterilizing a packaging installation for food and pharmaceutical products
Liquid crystal display with color sector backlighting