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According to the definition of "Electronic Signature Law", an electronic signature refers to data contained in a data message in electronic form and accompanied by data used to identify the identity of the signer and show that the signer approves its content.

Article 13 of the Electronic Signature Law stipulates that:

An electronic signature shall be regarded as reliable if it meets the following conditions:

(1) When the electronic signature production data is used for electronic signature, it belongs to the exclusive rights of the electronic signer;

(2) When signing, the electronic signature production data is only controlled by the electronic signer;

(3) Any changes to the electronic signature after signature can be found;

(4) Any changes to the content and form of the data message after signature can be found.

The parties can also choose to use electronic signatures that meet their agreed reliable conditions.