Amelia,

          Generally speaking, my clients don't sign my invoices; I
          don't expect them to.  Sometimes they might have to sign off
          on the amount within their own organizational system so that
          the check will be cut, but I don't expect to get a copy of
          that.  It is assumed that if you cash a client's check, then
          you are agreeing to the terms, whatever those may be.  Once
          in a while I hear a story about an artist who signs a
          limited use agreement, but the check says "work-for-hire" in
          fine print.  Cashing that check can be construed as
          acceptance of work-for-hire terms regardless of what the
          contract says.

          I'm not clear on why you are concerned about not having a
          signature on a work-for-hire agreement (or invoice).  Seems
          to me that it is the client who has the most to lose from
          not having a document signed by you. You, the artist, are
          giving up more by doing work-for-hire than they are and I'd
          think they'd want every documentation possible to make sure
          you can't squirm out of that agreement.

          Lynette Cook
          Morrison Planetarium
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