Thanks to those idiots advertising online for £25 for 2years we now have NO HD! They think they are clever but hey if i can see those ads online, if you can see it, don't you think sky security team can see it too? its done too openly! Even here I or you could be anyone acting as a hobby guy but actually is a sky hacker or security agent gathering information. This is not an encryption change they are playing with bitrate change; 2-3 years ago they done it as a test on sky italia and it worked for a short while then it was hacked again so they worked on it and improved the solution!!!
It's not a bitrate or any other encoding change, It is CI+
I.E the HD boxes have a private key and use des encryption to scramble the CW on the way to and from the cam/card interface to the demuxer.
The HD channels now need a CW not only derived from the card but then hashed with a private box CW. Oscam, etc doesn't have the des scrambling and private box CW yet so card sharing is down.
The newer HD boxes cant be Jtagged either so the private box CWs cannot be extracted.
The older digiboxes and old HD boxes did not have the capability to support CI+ so the SD channels have to stay encrypted without the extra des hashing to remain compatible.
I would not put it past sly to offer free standard hd box upgrades soon and enforce the switchoff or CI+ of SD channels.