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What I took from that is BECAUSE you don't own the DLC yourself, you cannot edit it... because you can't physically put equipment you don't own on it yourself. If, however, you own the DLC, you should be able to edit it freely.It seems that their solution to people sharing characters with DLC items is to just allow them to use the copy of the character but not modify the character. The take away from this is that if you share a CAS you likely will not be able to modify it at all. Hence creating your own characters is probably preferable as you can alter them as you like...but even if you don't you can hopefully see how the character was created and create it yourself.