新一代付費數位廣播電視鎖碼系統Viaccess是為D2MAC鎖碼系統的延伸，專為數位廣播(DVB/DAB)設計，早期用於法國的TPS
( Television Par Satellite )、ABSAT & CANALSATELLITE(simulcrypt)及瑞士的
SSR三大衛視系統。解碼器與(IRD)與IC卡( smartcard)間資料溝通規範與(D2MAC)系統相容，包含
前置碼、指令碼、資料參數一、資料參數二、資料長度等四項主要資訊，以下收錄歐洲專業技術網站原文提供有興趣者參考。
Viaccess ?
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1.manufacturer
There are two manufacturer of Viaccess decoder :
- Sagem
- XCOM
Sagem is used by TPS and is the only decoder which can operate at the
moment.
XCOM is used by ABSAT and CANALSATELLITE (simulcrypt).
The Swiss channels can be received with a XCOM and at the beginning of
1998
with the Sagem decoder.
2. Protocol
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Data exchange between decoder and smartcard follow this specification :
CLASS ,INSTRUCTION ,PARAMETER1, PARAMETER2 &LENGTH
CLASS : For Viaccess it is XXh and XXh
( like D2MAC )Every scrambling method have an instruction class.
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