SBCA Conditional Access & Encryption

Question 1

What is the primary purpose of a Conditional Access System (CAS) in satellite broadcasting?

Accepted Answer

To restrict content delivery to authorized, paying subscribers only

Answer

To boost signal strength for distant subscribers

Answer

To compress video for more efficient satellite transmission

Answer

To synchronize audio and video streams at the receiver

Question 2

What does DVB-CSA stand for in satellite encryption standards?

Accepted Answer

Digital Video Broadcasting – Common Scrambling Algorithm

Answer

Digital Video Broadcasting – Content Security Algorithm

Answer

Direct Video Broadcast – Conditional Subscriber Access

Answer

Digital Video Broadcast – Compressed Signal Authentication

Question 3

What is a Control Word (CW) in a DVB conditional access system?

Accepted Answer

A short-lived symmetric key used to decrypt the scrambled transport stream

Answer

A password used by the installer to configure the receiver

Answer

A digital certificate that authenticates the satellite headend

Answer

A command sent to the smart card to update subscription entitlements

Question 4

How frequently is the Control Word (CW) typically rotated in a DVB pay-TV system?

Accepted Answer

Every 10 seconds

Answer

Every 30 days

Answer

Every 24 hours

Answer

Every 128 packets

Question 5

What information does an Entitlement Control Message (ECM) carry in a CAS?

Accepted Answer

The encrypted Control Word needed to decrypt the current program

Answer

Subscriber billing address and account number

Answer

Software update data for the integrated receiver decoder

Answer

The satellite transponder frequency and polarization settings

Question 6

What is the function of an Entitlement Management Message (EMM) in a conditional access system?

Accepted Answer

To manage and update the authorization entitlements stored on the smart card

Answer

To carry the encrypted Control Word for real-time descrambling

Answer

To synchronize the satellite receiver's internal clock with the headend

Answer

To report signal quality measurements back to the service provider

Question 7

What is the primary role of a smart card in a satellite IRD (Integrated Receiver Decoder)?

Accepted Answer

To store subscription entitlements and decrypt ECMs to yield Control Words

Answer

To decode the MPEG video stream and output analog video

Answer

To perform LNB voltage switching for polarization control

Answer

To store the satellite dish pointing coordinates for automatic realignment