[opendtv] Re: HDMI issues

At 01:57 PM 2/28/2006 -0800, Kilroy Hughes wrote:


>Sounds like somebody set CGMS-A bits in Line-21 to "copy never", "copy
>once", or "copy no more".  A receiver is supposed to "do the right
>thing", like assert Macrovision (or DTCP or HDCP, etc.) on its video
>output, as well as pass the CCI bits.  Your recorder could be reacting
>to CGMS-A bits on its input or receiver generated Macrovision (sync
>pulse or color stripe distortion).  Welcome to the broacast flagged
>future.

Indeed.

Typical variants for Analog Protection System (i.e. classic Macrovision)
in the cable world are:

0 - Analog_Protection_Off
1 - AGC_Process_On_Split_Burst_Off 
2 - AGC_Process_On_2_Line_Split_Burst_On
3 - AGC_Process_On_4_Line_Split_Burst_On

When the set top sees a non-zero value (typically in private sections in the 
PMT)
it is supposed to do the wrong thing to the analog signal.

For CGMS-A, the set top is supposed to assert one of the following in line 21
(the XDS bits IIRC)

0 - Copying_Is_Permitted_Without_Restriction
1 - No_Further_Copying_Permitted
2 - One_Generation_Of_Copies_May_Be_Made
3 - No_Copying_Is_Permitted

And your PVR or DVD recorder is supposed to obey all this nonsense, assuming
it didn't get accidentally turned off when you made it region free...

gary


 
 
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