Yes If you sign the document on behalf of others, if you are officially authorized by the other party, and you are also an agent, then the legal responsibility will be borne by the authorized person, and if there is no authorization, the signatory will bear the responsibility. Acting on behalf of the signatory depends on whether it is authorized or not. It is illegal to act on behalf of the signatory, and it will bear the legal risks brought by the signatory's disapproval. Authorized signature is legal and can be found out.