OpenOffice 本來是採用 GNU Lesser General Public License (LGPL) 與 Sun Industry Standards Source License (SISSL) 雙重授權 (使用者可以選擇其中一種)，但剛剛在 Slashdot 上看到 Sun 決定將 SISSL 授權收起來：OpenOffice Goes LGPL。
OpenOffice 的官方網站上面 的License Simplification FAQ 是這樣寫：
On 2 September 2005 Sun announced the retirement of the Sun Industry Standard Source License (SISSL). As a consequence, no future Sun open-source project will use the SISSL. Projects currently using the SISSL under a dual-license scheme, such as OpenOffice.org, are dropping the SISSL and thus simplifying their license scheme as soon as the development cycle allows.
看起來是舊有的部分不動他，但新的版本釋出時只會剩下 LGPL 授權。
至於 SISSL 與 LGPL 最大的差異，在 comment 的地方有人說明了：
Re:Comparison of terms? (Score:5, Informative)
by tmasssey (546878) Alter Relationship on Sunday September 04, @02:48AM (#13471645)
(http://www.outoftheboxsolutions.com/)The biggest difference is that if you contribute and distribute your changes to an (L)GPL project, you must make your source publicly available. Under the SISSL, you could distribute binary-only versions of the project.
另外一件有趣的事情是這篇文章 (Slashdot 上的文章) 的原作者 Motor 在 submit 時標題是用 "OpenOffice single license: LGPL"，但 ScuttleMonkey 很雞婆的 (而且也誤解了) 改成了現在的 "OpenOffice Goes LGPL"...
