Iran's explanation is that the nuclear smuggling network run by Pakistan's Abdul Qadeer Khan had sent it this document in 1987, along with other documentation on centrifuges Iran had received, but that Iran had not asked for it.
This information is subject to change, and software implemented according to this document should be tested with final operating system software and final documentation.
Use of the document is voluntary, they said, but the groups believe it will provide a model for the legal documentation supporting derivatives clearing.