B2C2 FlexCop
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A quite interesting and well-designed PCI interface chipset by B2C2 Inc.. It contains a flexible MPEG2 Transport Stream interface with hardware PID filters, but is still able to deliver the complete Transport Stream. As far we know the chipset contains a Smartcard interface and a CSA Descrambler. As it tends to display some quirks in the i2c Protocol interface, the PCI bridge driver thus needs to know which clients are allowed on the bus in order to avoid lockups.
The Linux driver works quite good and has no known drawbacks. Support for the IC's Smartcard Interface and CSA Descrambler features, however, are missing.
The B2C2 FlexCop/FlexCop2 family is used in several TechniSat DVB cards and USB devices.