Editing B-CAS (section)

{{Short description|Japanese conditional access system}}
[[File:TOSHIBA 55X1 02.jpg|thumb|right|B-CAS cards in a [[Toshiba]] Cell Regza [[set-top box]]]]
'''B-CAS''' (BS Conditional Access Systems Co., Ltd.) is a vendor and operator of the [[ISDB]] [[Conditional Access System|CAS]] system in [[Japan]], largely owned by the public broadcaster [[NHK]] with some other electronics companies and broadcasters airing in [[Broadcasting Satellite System Corporation|BSAT]]. It also refers to the reception method (B-CAS method) that this company offers. 

All [[ISDB]] receiving apparatus such as [[Digital terrestrial television|DTT]] TV, tuner, and DVD recorder except [[1seg]]-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.<ref>https://www.b-cas.co.jp/cardorderNew/temp-reissue-agreement.html</ref>

Implementations of ISDB-T and [[ISDB-T International|ISDB-T International (SBTVD)]] outside Japan do not use the B-CAS system at all as they do not employ the ''Copy-Once'' encryption method used on ISDB broadcasts in Japan. For these countries, some operators may choose to implement their own copy protection system.