Here's my description of CAS and DRM. CAS is intended to handle limited content access scenarios where the consumption is immediate. By contrast, DRMprotects the content during its entire lifetime. CAS can be viewed as supporting a subset of the full set of functionalities of DRM (putting it another way, CAS is a degenerate form of DRM). Both methods encrypt the content. I wouldn't view CAS necessarily supporting "pipe protection". When Ithink of "pipe protection" SSL comes to my mind. Regards Gerard Prashant Desai wrote: How about the scrambling with CAS ? it encrypts the content bits &on top of it also provides the Pipe protection , correct ? Pls advise , Regards, Prashant -----Original Message----- From: opendtv-bounce@xxxxxxxxxxxxx[1] [mailto:opendtv-bounce@xxxxxxxxxxxxx[2]] On Behalf Of Kon Wilms Sent: Saturday, March 11, 2006 11:01 PM To: opendtv@xxxxxxxxxxxxx[3]; opendtv@xxxxxxxxxxxxx[4] Subject: [opendtv] Re: CASV/S DRM What's precisely difference between CAS Scrambling &DRM Systems ? Well if you want to put it simply: CAS = Pipe protection. Encrypt the dataflow and provide conditional reception of bits (the bits may or may not be wrapped with DRM). DRM = Content protection. Encrypt the bits in their stored state (file, ...) and provide playback/location/aging rights via the wrapper (they may be delivered via a CAS system). Cheers Kon ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx[5] with the word unsubscribe in thesubject line. Disclaimer note on content of this message including enclosure(s) and attachments(s): The contents of this e-mail are the privileged and confidential material of VSNL. The information is solely intended for the individual/entity it is addressed to. If you are not the intended recipient of this message, please be aware that you are not authorized in any which way whatsoever to read, forward, print, retain, copy or disseminate this message or any part of it. We apologize if you have received this e-mail in error and would request you to please notify the sender immediately by return e-mail and delete it from your computer. The views expressed in this e-mail message are those of the individual sender, except where the sender expressly, and with authority, states them to be the views of VSNL. This e-mail message including attachment(s), if any, is believed to be free of any virus and VSNL is not responsible for any loss or damage arising in any way from its use ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx[6] with the word unsubscribe in thesubject line. --- Links --- 1 mailto:opendtv-bounce@xxxxxxxxxxxxx 2 mailto:opendtv-bounce@xxxxxxxxxxxxx 3 mailto:opendtv@xxxxxxxxxxxxx 4 mailto:opendtv@xxxxxxxxxxxxx 5 mailto:opendtv-request@xxxxxxxxxxxxx 6 mailto:opendtv-request@xxxxxxxxxxxxx ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.