An attempt to prove that Mons. Lefebvre did not sign the documents of Vatican Two has arisen on this crummy blog. A gentleman has claimed that his signature on certain documents of Vatican Two merely indicated his presence at the Council and not his acceptance of the documents he signed.
The problem with that claim that it is a lie spread by The Angelus/SSPX and it is a lie memorised and memorialised as part of the catechism of schism denial.
https://www.catholicculture.org/culture/library/view.cfm?recnum=857