When is compressed not really compressed ?

A bit puzzled here ..
doing a standard rman incr0 backup. I dont want compression ..
The output tells me its compressed .. or does it?
Is this really compressed???
Starting backup at 27-JAN-10
channel ch00: starting compressed incremental level 0 datafile backup set
channel ch00: specifying datafile(s) in backup set
input datafile file number=00004 name=/dbX/db04/oradata/X/users01.dbf
channel ch00: starting piece 1 at 27-JAN-10
channel ch01: starting compressed incremental level 0 datafile backup set
channel ch01: specifying datafile(s) in backup set
input datafile file number=00028 name=/dbX/db04/oradata/X/users02.dbf
channel ch01: starting piece 1 at 27-JAN-10
channel ch02: starting compressed incremental level 0 datafile backup set
channel ch02: specifying datafile(s) in backup set
Script below:
ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK;
ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE 'SBT_TAPE';
RUN {
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW of 89 DAYS;
CONFIGURE BACKUP OPTIMIZATION CLEAR;
CONFIGURE CONTROLFILE AUTOBACKUP OFF;
ALLOCATE CHANNEL ch00 TYPE 'SBT_TAPE';
ALLOCATE CHANNEL ch01 TYPE 'SBT_TAPE';
ALLOCATE CHANNEL ch02 TYPE 'SBT_TAPE';
ALLOCATE CHANNEL ch03 TYPE 'SBT_TAPE';
ALLOCATE CHANNEL ch04 TYPE 'SBT_TAPE';
ALLOCATE CHANNEL ch05 TYPE 'SBT_TAPE';
BACKUP INCREMENTAL LEVEL=0
SKIP INACCESSIBLE
FORMAT 'bk_%d_%s_%p_%t'
FILESPERSET=1
DATABASE
INCLUDE CURRENT CONTROLFILE;
CROSSCHECK BACKUP;
CROSSCHECK COPY;

Show all revealed my problem:
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 1;

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