Where Can i find the lecture Videos of BSD 2011 i recently heard that there was a conference on Birch and Swinnerton dyer conjecture Held at Cambridge on May 4 until May 6,
the main theme is  "The conference marks the 50th anniversary of the Birch-Swinnerton-Dyer Conjecture and aims both to explain the state of our knowledge and to reflect on the modern approaches to the conjecture and related problems."
but unfortunately i cant find any video archives about the conference in any of the google searches ,but i found some pdf files,and photos which are not informative in the conference site of MR.Tim Dokchitser,
so can anyone give a reference to the video archive site of that conference ,or does the video archive exists???
i forward this question to Mr.William Stein,and Tim dokchitser,who were the key persons in organizing ,if they are successful in giving me the appropriate links of video archive i would be much thankful
thanks a lot everyone,touch your feet for your help
 A: There was an École d'été sur la conjecture de Birch et Swinnerton-Dyer in Paris in the summer of 2002.  The videos of the lectures (by P. Colmez, H. Darmon, B. Edixhoven, B. Mazur, J. Nekovár, J. Oesterlé, W. Stein, E. Urban and S. Zhang)
are available.
A: I checked that the BSD conference was held at DPMMS, not the Isaac Newton Institute (INI). Quite a lot of video lectures are kept online at the INI website, and there is much to be learned there on many subjects. Similarly, the Mathematical Sciences Research Institute at Berkeley (MSRI) has many video lectures available on line. Probably other mathematical institutes around the world do this,
and the number doing so is likely to increase. So there are many opportunities available online to learn from high calibre mathematicians for those with a desire to do so. In some case, instructional  conferences outlining the basic underlying theory are available too, prior to the research level conferences. Nevertheless, following such lectures usually would require a mathematician at an early stage to have previously undertaken much independent study and hard work. 
A: it seems that the lectures were not recorded (there are only photos on the conference website); 
so there is no point in searching for the videos.
However, there are a few video excerpts available from Professor Stein's channel..small consolation. 
(1) bsd1 
(2) bsd2 
(3) bsd3
