[1] [CITE@en[The WebM Project : The WebM Project : Welcome to the WebM Project]]
([TIME[2010-05-20 04:53:45 +09:00]] 版)
<http://www.webmproject.org/>

[2] [CITE[IRC logs: freenode / #whatwg / 20110104]]
( ([TIME[2011-01-08 00:41:57 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20110104#l-955>

[3] [CITE[IRC logs: freenode / #whatwg / 20110112]]
( ([TIME[2011-01-19 00:18:13 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20110112>

[4] [CITE@en[Get WebM!]]
( ([TIME[2011-02-07 20:24:56 +09:00]] 版))
<http://webm.html5.org/>

[5] [CITE[The WHATWG Blog — webm.html5.org]]
( ([TIME[2011-02-08 22:50:29 +09:00]] 版))
<http://blog.whatwg.org/webm-html5-org>

[6] [CITE[IRC logs: freenode / #whatwg / 20110203]]
( ([TIME[2011-03-19 11:46:31 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20110203#l-505>

[7] [CITE@en[WebM Community Cross-License | WebM Community Cross-License Administration]]
( ([TIME[2011-04-30 12:34:57 +09:00]] 版))
<http://www.webm-ccl.org/>