Technically and legally, the specific reference to "software copyright (c) 1999, Sun Microsystems., http://www.sun.com" from the NOTICE of Apache Derby distribution along with jdk 7 bundles does not violate the rebranding feature, but it is good to update it for the better.

Such instance can be found at:

http://jre.sfbay.sun.com/java/re/jdk/7/promoted/all/b144/binaries/solaris-sparc/db/NOTICE

and it is the same file on all platforms. The file seems to be generated by the buildnotice TARGET IN THE TOP LEVEL build.xml file