"Operation not permitted" - on deleting folders

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I was about to delete a Time Machine Backup-Folder, and I got that: 

MacBook-Air:.Trashes root# rm -Rf 502
rm: 502/2013-06-27-195031/Grob 109A/Applications/Merlin.app/Contents/Frameworks/CoreDataNet.framework/CoreDataNet: Operation not permitted
rm: 502/2013-06-27-195031/Grob 109A/Applications/Merlin.app/Contents/Frameworks/CoreDataNet.framework/PrivateHeaders: Operation not permitted

When Time Machine backups your data, it also applies ACLs: 

WroDos-MacBook-Air:.Trashes root# ls -le 502/2013-06-27-195031/Grob\ 109A/Applications/Merlin.app/Contents/Frameworks/CoreDataNet.framework/CoreDataNet

lrwxrwxrwx+ 1 appleadmin admin 28 Dec 28 2007 502/2013-06-27-195031/Grob 109A/Applications/Merlin.app/Contents/Frameworks/CoreDataNet.framework/CoreDataNet -> Versions/Current/CoreDataNet 

0: group:everyone deny write,delete,append,writeattr,writeextattr,chown

The solution is deleting the ACLs.

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