1. We can only view the video on personal computers with these system requirements:
- OS: Windows XP, Windows Vista, Windows 7, Mac OS 10.5 or higher.
- Browsers: Internet Explorer 8 or higher, Firefox 4 or higher, Safari 5 or higher, Chrome 13 or higher.
- Plugin: Adobe Flash Player 10 or higher
2. We will not be able to view the video on tablets and smartphones.
3. We will not be able to download and save the video. IMPORTANT: If JE discovers that someone has ripped / recorded the video and uploaded it elsewhere (e.g. streaming sites or Facebook), they may remove the video even before September 15 is over. (Yup, the possibility is there.)
4. We will not be able to watch the video after the day is over. (Cue: Let's crash JEHP again on the day itself, shall we?)
5. We have a hint that the anniversary video is about Aikotoba ~ Te wo Hiite performance, but JE mentioned "we can't tell you about the contents of the video". And as to the possibility that it will be included in a DVD in the future, JE also hasn't specified anything.
They are just reminders, but please take note of number 3. We are aware that people are fond of sharing, but please refrain from publicly doing so on the day itself, lest JE catches on, removes the video and deprives us of such privileges in the future.
Source: http://www.jehp.jp/news/info/index.html?scroll=whatsnew_1, http://www.jehp.jp/news/info/10th_Anniversary/index.html and sg_paanas and dara_z for kindly translating the info.