These people that press reply all. Idiots. All of them. ;) Sorry to Nick for exposing my missive to him to the general public. Sorry to Martin for discussing his surname to the general public.
And for the record . I flipping hated Balaam and the Angel. Poppy goth rubbish. Jem On 2/6/08 14:19, "Nick Reynolds-FM&T" <[EMAIL PROTECTED]> wrote: > Sorry - but should you be doing this via the backstage list > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Jem Stone > Sent: 02 June 2008 14:07 > To: [email protected] > Subject: Re: [backstage] iPlayer download client for the Mac > > You've spelt belam as belham again. Maybe you keep thinking of that > lovely bit of south london. But that was balham or the band balaam and > the angel. > > Jem > > > On 2/6/08 13:47, "Nick Reynolds-FM&T" <[EMAIL PROTECTED]> wrote: > >> LOL >> >> It didn't say "we want secure DRM but not TOO secure" either >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Andy >> Sent: 30 May 2008 16:42 >> To: [email protected] >> Subject: Re: [backstage] iPlayer download client for the Mac >> >> Ryan Morrison wrote: >>> You say "Didn't the Trust tell the BBC to produce download clients >>> for >> >>> other platforms as soon as possible?" But didn't the Trust also set >>> the conditions for DRM? >> >> It doesn't say how secure the DRM has to be. >> And security wise it doesn't really need to be secure at all. After >> all the Beeb are blasting the programs out of transmitters, in digital > >> form, at higher quality. Security is defined by "weakest link". So as >> long as you make some small effort you're fine, you can't lower the >> security any more than it is now because their is none. >> >> The BBC keeps saying "we need someone to write DRM for us", stop being > >> such a bunch of lazy people and do it yourself. Helpfully the BBC >> pre-knows all the restrictions they want (so no need to actually >> encode the rights data ;)). >> >> A *very* simple method: >> >> 1. Assign client software a key or set of keys (symmetric or >> asymmetric doesn't really matter) 2. Take MP4* file prepend the files >> broadcast date(s). >> 3. Chose random symmetric encryption key 4. Cypher that data 5. >> Prepend a copy of the symmetric key encrypted with each client > encryption key 6. >> Client decrypts with it's key and checks the broadcast date, if it's >> over 7 days old it refuses to play. >> 7. Job done, go to nearest pub (additionally actually test the >> software >> ;)) >> >> C = E_c1(k),E_c2(k),...,E_cN(k),E_k(T,P) >> Where C_x donates encryption under key x. >> c1,c2 to cN represents client keys 1 2 and N (repeat as needed) k is >> the item (or episode key) P is the item (or episode) T is the >> broadcast timestamp >> >> Decryption is left as an exercise for the reader^. >> >> As long as you don't use a Stream cypher the user will need to know >> the items key to tamper with the broadcast date, and if they have that > >> key they can decrypt anyway! >> >> Might want to use some more complex method for encoding rights data. >> >> Weakness is the client key or item key could be compromised, but all >> DRM schemes have this weakness. >> >> It's stronger than plaintext so no less secure the Digital TV. >> >> Could probably code that in a few days (provided you have some kind of > >> cryptography library available) >> >> * or any other format. >> ^ if you really can't work out how to do it then ask, but you really >> should have at least one person capable of understanding this >> >> >>> The point here isn't so much that someone has made a download client >>> but has made a download client that allows for the download of DRM >>> free iPlayer files >>> - which is against the terms the BBC have agreed for the iPlayer (I >>> think that's right). >> >> The point is the BBC could have added a very simple DRM scheme and >> have done the same thing. >> >>> Whether you agree with that or not - it is simple fact. >> >> Haven't seen the rights that the BBC have agreed. But if it says >> "Windows DRM Only" I would strongly suspect that the agreement may be >> illegal, particularly given EU vs Microsoft's ruling about tying. >> Would the BBC care to show us all this alleged document that is tying >> their hands? >> >>> And Jem isn't trying to censor the internet - just asking that you >>> talk about 'getting around the DRM on iPlayer files' somewhere that >> isn't run by the BBC. >> >> Trying to restrict discussion of certain topics isn't censorship? What > >> precisely do you call it then? >> >> Andy >> - >> Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, >> please visit >> http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. >> Unofficial list archive: >> http://www.mail-archive.com/[email protected]/ >> >> - >> Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, >> please visit > http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. >> Unofficial list archive: >> http://www.mail-archive.com/[email protected]/ > > - > Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, > please visit > http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. > Unofficial list archive: > http://www.mail-archive.com/[email protected]/ > > - > Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please > visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. > Unofficial list archive: > http://www.mail-archive.com/[email protected]/ - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/[email protected]/
