Most owners of copyrights will be interested in the civil penalties associated with unjust enrichment based upon their work. However, Japanese law also authorizes criminal penalties in certain circumstances of copyright infringement.
Even if a deceased writes a will that excludes a spouse or child, under Japanese law, a spouse can almost always claim a portion of the estate by right. This portion may not be as large as the spouse would have received if there had been no will at all, but this provision is meant to ensure that spouses will always receive something upon the death of their partner.
Spouses who are worried that their partner might file a fraudulent divorce registration in Japan can file a Non-Acceptance of Notification of Divorce (rikon fujuri moshidesho 離婚不受理申出書) in order to prevent acceptance of a divorce form. While this non-acceptance used to only last for 6 months, in 2008 the law was changed to allow such non-acceptance to be valid until withdrawn by the submitting spouse.