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RPC-1 andRPC-2 are designations applied tofirmware forDVD drives to enforceregional lockout. Older DVD drives use RPC-1 firmware, which allows DVDs from any region to play. Newer drives use RPC-2 firmware, which enforcesDVD region coding at thehardware level. SeeDVD region code § Computer DVD drives for further information.
Some RPC-2 drives can be converted to RPC-1 with the same features as before by using alternative firmware on the drive, or on some drives by setting a secret flag in the drive'sEEPROM.
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