Manu Abraham <abraham.manu@xxxxxxxxx> writes: > The first one that i had seen was with TPS, and this was the only way it > could be worked. In fact stream level decryption according to TPS wasn't > probably stream level decryption but only program level decryption. I > might be wrong here though, but that was the only thing that got it to > descramble. You statement related to "program level decryption" is misleading. In all cases only the elementary streams are encrypted. Sending CA descriptors at program level is only a mean of saying "this descriptor is valid for *all* elementary streams of this program" Here's the section 8.4.3.4 of EN50221 that specifies this behavior: The CA_descriptor after the current_next_indicator is at the programme level and is valid for all elementary components of the programme. The CA_descriptor(s) at elementary_stream level is (are) valid for the elementary_stream only. If, for one elementary_stream, CA_descriptor(s) exist at programme level and at elementary_stream level, only the CA_descriptor(s) at elementary_stream level are taken into account. HTH
