Vector drawings have to be fully editable when they have to be included in layout documents.
And when a vector file is editable, it is fully editable. You can't exclude some layers. Make a contract that handles these kinds of things.
thanks for your feedback, is there no way at all to do it? any tricks you can think off?
With inexperienced users you couldtry and bury it deep down in a hierarchy of clipping masks and/or layers and lock it there. Works better if it is connected with parts of the actual graphic somehow, so that hiding ot deleting one of those masks will hide or delete everything.
To my mind it would be better for your relationship to just trust them. At least you work for them - they must be trustable somehow.
thanks for your advice. There are other reasons why I need this though. Trust is not the issue.