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B-CAS (BS Conditional Access Systems Co., Ltd.) is a vendor and operator of theISDBCAS system inJapan, largely owned by the public broadcasterNHK with some other electronics companies and broadcasters airing inBSAT. It also refers to the reception method (B-CAS method) that this company offers.
AllISDB receiving apparatus such asDTT TV, tuner, and DVD recorder except1seg-only devices require a B-CAS card under regulation and B-CAS cards are supplied with most units at purchase. B-CAS cards cannot be purchased separately, except in cases of damage, loss, purchase of used equipment, or theft. As of February 2025, replacement B-CAS cards cost ¥2,310.[1]
Implementations of ISDB-T andISDB-T International (SBTVD) outside Japan do not use the B-CAS system at all as they do not employ theCopy-Once encryption method used on ISDB broadcasts in Japan. For these countries, some operators may choose to implement their own copy protection system.
