Your camera may be embedding copyright information into the files when recorded to your CF card so you need to check whether this is occurring and, if so, change the settings in-camera.
Unfortunately Aperture, unlike Lightroom, cannot alter the "Copyright" field.
I connect Camera.
I review import options, specifically Copyright info.
I Leave the info blank
Do you also see the starnge copyright, when you import using Preview or Image Capture? Do images imported differently also show the wrong copyright tag?
What happens, if you do not leave the field blank, but set it to a different value? Can you overwrite the copyright notice IPTC field?
And do you have set the Metadata preset to "replace" instead to "append"? Otherwise values set by the camera will not be cleared.
Also check the Metadata preset you are using by setting it to "Edit" and look, if you have missed one of the tags relating to copyright notices and enable it in your preset to be able to alter it.
P.S. I have checked this with Aperture 3.4.3. what is your version?OS X Mountain Lion, 2.4 GHz I.Core i7, 16GB, 500GB SSD
In addition to the IPTC "Copyright Notice" field there is another field called "Copyright" which Aperture cannot change and which the camera can embed in the files...
That I understood from your post
But I wanted to be sure, that Michel has cleared the fields that can be cleared on import - using presets with "append" will do nothing, and it was not clear from the post that the preset was set to "append" not "replace".
If it is really the "EXIF" copyright field, and Michel has the copyright to the images taken with the own camera, then I'd recommend to use exiftool to reset this field in the images that already have been taken, see my User Tip here how to modify the EXIF tags that Aperture will not modify:
Obviously someone had purchased and then returned the camera. It was in the camera setting.
Thanks for letting us know! Who would have thought that a new camera already has owner settings by a previous buyer!