Adobe Reader and Acrobat Security Initiative

4半期ごと、Microsoftの"Patch Tuesday"と同じタイミングでUpdate releaseになるらしい。
http://blogs.adobe.com/asset/2009/05/adobe_reader_and_acrobat_secur.html

Regular Security Updates – Starting this summer with the initial output of our security code hardening effort, we plan to release security updates for all major supported versions and platforms of Adobe Reader and Acrobat on a quarterly basis. Based on feedback from our customers, who have processes and resources geared toward Microsoft’s “Patch Tuesday” security updates, we will make Adobe’s quarterly patches available on the same days. (Although our 3/10/09 and 5/12/09 security patches landed on Patch Tuesday, the timing was coincidental. In both cases, we shipped the patches as soon as we finished testing them.)