dvbapi is most likely your problem
First this aint newcamd but dvbapi/capmt.
"TVH is configured to use a newcamd client with the following settings;
Mode: 6 (OSCam new pc-nodmx (rev >= 10389))
Camd.socket filename / IP Address (TCP mode): /tmp/camd.socket
Listen / Connect port: 0"
dvbapi asks keys for all caid's in the source stream, that usualy dont work so good.
You have 2 options.
1, use proper newcamd in tvh.
2, use a stream filter in tvheadend to make 0963 exclusive.