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
Algorithm for color corrected analog dimming in multi-color LED system
Transmitting apparatus and retransmitting method
Image quality assessment
Method and device for determining a set of frequencies that can be used for transmitting information between radio transceivers of a network operating with frequency hopping
Register files for a digital signal processor operating in an interleaved multi-threaded environment
Decentralized processing network
Delay interferometer using magneto-optic effect of a variable faraday rotator
  Randomly Featured Patents
MESFET mixer circuit having a pulse doped structure
MOS transistors having inverted T-shaped gate electrodes
Microfilm reader printer equipped with improved exposure amount control arrangement
Triacylglycerol-based alternative to paraffin wax
Process and device for processing slag and other combustion residues from waste incineration plants
DRAM cell with a cradle-type capacitor
Lubricant ashless antiwear-antioxidant additive
Power train
Interactive asynchronous game offline play architecture
System and method for adapting the ambience of a local environment according to the location and personal preferences of people in the local environment