[Q] Can't delete files from lib folder

I have a problem with a apk from a Dutch tv provider ziggo....

With this app we are able to watch tv but only on non-rooted devices.......
I have 4 android devices and ofcourse they are all rooted and running on custom roms.

The first apk ziggo provided was cracked in a couple of days, for what i understand 2 "so" files had strings that searched for SU files and if they where found the app won't let you watch tv. These files where modified and recompiled so the app worked perfect on rooted devices.

Now.......ziggo launched an update with many bugfixes so i removed the old app en installed the new one.
Now to get it working again i need to replace 2 files in data/data/nl.ziggotv/lib

These files are "so" files but i can't move/delete/override these new files anymore.......
I tried everyting in root explorer, i also can't change r/w/e permissions over these files........what to do??? and how are these files protected??

For Devs who want to help me out, here's a link to the ziggo apk

https://dl.dropbox.com/u/24745264/Ziggo%20TV.apk