I think the important part of that document is this:
Persons who use closed systems to create, modify, maintain, or transmit electronic records shall employ procedures and controls designed to ensure the authenticity, integrity, and, when appropriate, the confidentiality of electronic records, and to ensure that the signer cannot readily repudiate the signed record as not genuine. Such procedures and controls shall include the following:
My interpretation of that is a closed system is one that appropriate security measures have been taken.
Judging by that DocuSign would qualify. I'm currently working with DocuSign to enable our web site to send documents to our customers to sign. When the process is done, we not only need to save the documents that were signed, but a summary document that describes the process the documents went through to be signed. I'm no lawyer, but in my opinion, DocuSign would satisfy the requirements. I would guess that other e signature companies do comparable things...