Mid October, I contacted the jai-core project on java.net to change the license to a free/open source one: Issue35. He just replyed he is accepting the issue. This could be very good for fop or other packages that use jai in Debian. Many thanks to aastha!
Note from the website:
This project contains the source code for the core Java Advanced Imaging API reference implementation containing the packagesjavax.media.jai.*andcom.sun.media.jai.*
