ADV7842-5 has no HDCP keys as if it is ADV7842-5P. How is this possible? We have working ADV7842-5 with HDCP keys and non-working ones without HDCP keys from the same batch.
We've verified this by checking the HDCP registers and behaviour of failing ADV7842-5, they contain no HDCP keys.
NB: We are part of the Taiwanese electronics group Coretronic, we are HDCP licensees.