I am basically going by what Kotaku has posted but come October...
Japan has recently passed a stricter revision to its copyright laws making, among other things, the download of illegally uploaded materials punishable by a prison sentence of less than 2 years and/or a fine of up to ¥2,000,000 (US$25,106).
The House of Representatives quietly passed the revision with virtually no coverage and almost no public announcement, second, the revision was rushed through and passed without council or discussion. Members of the Ministry of Education who could potentially place a vote against the revision have been switched out so there is no opposition in place. Of the public, the only major group of people who are aware of what is going on are the 2-channel using sub-culturalites, a group often spoken of by the mass media as social outcasts and potential criminals and as such does not have much political swaying power in the public eye.
As to the actual effects of the revision, attorney at law, Toshimitsu Dan recently spoke on what Japan can look for in the future.
The Effects:
1. Ripping and copying of copy-protected and encoded materials like DVDs and games is no longer considered "for personal use" and is punishable.
2. The sale of software and hardware that circumvents copy protection and access protections is forbidden.
3. The intentional download of illegally uploaded materials is now punishable.
Basically, according to Toshimitsu Dan, video sites like YouTube and Nico Nico Douga that download temporary data to your computer will potentially be targets for regulation in Japan. That, and/or anybody who uses those sites could face prison time. Not only that, but thanks to the arbitrary wording of the revision that leaves it wide open for abuse by the authorities, the law can even affect Japanese citizens outside the borders of Japan. Even a Japanese citizen in America who watches a video on YouTube could potentially be a target for criminal proceedings.
http://kotaku.com/5920140/come-october-dont-use-youtube-in-japanhttp://www.itmedia.co.jp/news/articles/1206/20/news015.html