<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>So, Steve, if understand you correctly, the frequency data would not be available when a scan takes place? <br>Presumably, however, it would be possible to add such information manually the the database in, for example, MythTV. I am doing this now because BBC HD has changed some information such as 'symbol rate' etc. Now I have to do the rest by hand or rescan.<br>One thing I am happy about though is, for the first time, I have been able tot get HD working properly on all the HD channels - bar the BBC which I haven't been able to try yet. I am dreading the introduction of Wayland to Ubuntu which will probably muck everything up.<br><br>The EPG is not so important to MythTV because the data can be gleaned from elsewhere, so that is not any real problem for MythTV. I don't publish my grabber
programs because I suspect that certain websites would be deluged with downloads, for EPG purposes, and those same web sites might block or obfuscate downloads. Having said that the only one I use to any extent is one for 'Travel' which uses their web site so they might not object.<br><br>Brian<br></div><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><br><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Steve Kerr <steve@cullingworth.net><br><b><span style="font-weight: bold;">To:</span></b> BradfordLinuxUserGroup <bradford@mailman.lug.org.uk><br><b><span style="font-weight: bold;">Sent:</span></b> Tue, 28 June, 2011 1:21:07<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [Bradford] BBC's plan to encrypt HD content management<br></font><br>To quote the article:
"...it is requesting that it be allowed to encrypt the data associated with
TV listings without which set-top boxes are not able to decode the TV
content". <br><br>What they are describing there is the encryption (or obfuscation) of the DVB-SI and (possibly) MPEG-PSI. The STB (or other client) uses these data streams to find the content. The SI (System Information) describes where the service (what mere humans call a 'channel' - e.g. BBC1) can be found i.e. what frequency and other parameters to use to tune to the digital multiplex. The PSI (Program Specific Information) within each multiplex describes how to find the component parts of the service within that multiplex, i.e. the Packet IDs for the video, audio and other elementary streams.<br>
<br>The 'listings', or EPG data, is held in the Event Information Table (EIT) which is referenced as a component of the service in the PSI. Some service providers encrypt the EIT data to prevent it being used by unauthorised STBs but this doesn't prevent the STBs from receiving and decoding the services.<br>
<br>Freesat did a similar thing to prevent any standard DVB satellite receiver from picking up the Freesat services. In this case I think they just used a propriety means to describe where the services are (i.e. non-standard SI & PSI). The Freesat services could still be received by my media centre (non-Linux at the time I'm afraid) by doing a scan. The problem came when services were moved - they just disappeared from my media centre's perspective and I had to perform a manual rescan. <br>
<br>.Steve<br><br>
<br><div class="gmail_quote">On 27 June 2011 20:23, Brian <span dir="ltr"><<a rel="nofollow" ymailto="mailto:bradlug@techchico.org.uk" target="_blank" href="mailto:bradlug@techchico.org.uk">bradlug@techchico.org.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div style="font-family:times new roman, new york, times, serif;font-size:12pt;">The BBC plan to introduce encryption in regard to their HD channels. It
will mean that existing Linux boxes won't function anymore and that, of
course, will include MythTV *(see below).<br><br>More information:-<br><span>
<a rel="nofollow" target="_blank" href="http://news.bbc.co.uk/1/hi/technology/8259154.stm">http://news.bbc.co.uk/1/hi/technology/8259154.stm</a><div style="display:inline-block;width:16px;min-height:16px;"> </div></span><br>
From which comes:-<br>
"Critics of the BBC's request say that open source licenses are
incompatible with the regulations because DRM locks down software so
that it cannot be altered by the user. "<br><br>Ofcom:-<br><span><a rel="nofollow" target="_blank" href="http://tinyurl.com/66umlcx">http://tinyurl.com/66umlcx</a><div style="display:inline-block;width:16px;min-height:16px;">
</div></span><br><br>There is a PDF on that page and in it is an email address which can be used to respond to the BBC's plans via Ofcom.<br><br>Put simply, as I understand it, the BBC can't encrypt the video but can encrypt the EPG etc. <br>
*If
this is all they intend to do then, as far as MythTV is concerned, it
won't be much of a problem as, presumably, listings can be obtained from
the Net. I have written 'grabbers' for channels which aren't in the the
standard EPG so the BBC should not prove any more difficult. However,
with standard Linux set-top boxes this may prove a problem.<br><font color="#888888"><br>Brian<br></font></div></div><br>_______________________________________________<br>
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