diff -Nru vdr-1.7.10-vanilla/pat.c vdr-1.7.10-disable_ca_updates/pat.c
--- vdr-1.7.10-vanilla/pat.c	2009-11-22 18:06:18.000000000 +0200
+++ vdr-1.7.10-disable_ca_updates/pat.c	2009-11-22 18:20:43.000000000 +0200
@@ -452,6 +452,7 @@
             }
         if (Setup.UpdateChannels >= 2) {
            Channel->SetPids(Vpid, Ppid, Vtype, Apids, ALangs, Dpids, DLangs, Spids, SLangs, Tpid);
+           if (!Channel->IsPlug())
            Channel->SetCaIds(CaDescriptors->CaIds());
            Channel->SetSubtitlingDescriptors(SubtitlingTypes, CompositionPageIds, AncillaryPageIds);
            }