It depends. According to the authorization of the licensor, it is a legal act to sign on behalf of the licensor. It is illegal to sign on behalf of others without the entrustment or authorization of the client, and will bear serious criminal responsibility. For example, if a national civil servant signs an important request without the consent, approval or authorization of the person who has the right to deal with it, causing heavy economic losses or casualties, he will bear criminal responsibility. According to Article 920 of the Civil Code, the trustor may entrust the trustee to handle one or more specific affairs, or entrust the trustee to handle all general affairs.