BD-J reverse engineering possible ?

[radius]

Hi,

I've been reading some posts on the tools used to remove region locking from BD-J BRs,

as i understand it, "Blu-ray Region Code Remover 2.5" and AnyDVD modify some java classes when needed then resign the jar files,
could someone tell if it's possible to actually modify the java code ?
or is it just something like a byte swap only that those tools do ?

If it's possible to change the code is there any method I could use ?

I tested decompiling stuff with "jad" but it could not decompile some classes and when trying to compile bak with "javac" it would not work because of non-referenced dependencies between the classes,
and in any case I have no idea how to resign the stuff.

Thanks

[radius]

Eheh no one have an idea about this ^^ ?
I just tested the "Blu-ray Region Code Remover" tool ans it looks like it's actually adding code to java classes on region locked BRs, I guess it decompiles en recompiles the code ...uess,
but still no idea how it's done :/