unclean dependencies between nvidia 304.108-2 and 325.15-2.s

[michaa7]

I have installed nvidia-304-driver (due to my 6xxx serie's card), but d-u wants to update nvidia-vdpau-driver to 325-siduction. I have no clue what this package is needed for, and the 325 from debian was already installed, with no obvious harm for X or my system. I simply want to point out this fact as it does not seem right and at least is confusing.

# apt-cache policy nvidia-vdpau-driver
nvidia-vdpau-driver:
 Installiert:           304.108-2
 Installationskandidat: 325.15-2.siduction.1
 Versionstabelle:
    325.15-2.siduction.1 0
       900 http://packages.siduction.org/fixes/ unstable/non-free i386 Packages
    325.15-1 0
         1 http://ftp.de.debian.org/debian/ experimental/non-free i386 Packages
*** 304.108-2 0
       900 http://http.debian.net/debian/ sid/non-free i386 Packages
       100 /var/lib/dpkg/status
    304.108-1 0
       500 http://ftp.de.debian.org/debian/ testing/non-free i386 Packages
    304.88-1+deb7u1 0
       500 http://ftp.nl.debian.org/debian/ stable/non-free i386 Packages

I am now holding back this package which doesn't seem a real solution either.