Encrypted document processing method and system

The invention discloses an encrypted document processing method and system, and the method comprises the steps: taking each page of an original secret-related document as a document image, carrying out the encryption of the document content contained in each document image from a multi-dimensional angle based on the digitalization features of an electronic document or the black and white color distribution features of a paper document, generating a digital watermark containing encryption information, embedding the digital watermark into an original secret-related document to obtain an encrypted document, determining the encryption level of the encrypted document according to the use frequency of the original secret-related document, and when an operation instruction for the encrypted document is received, determining whether the operator has the operation authority of executing the operation content contained in the operation instruction on the encrypted document or not according to the identity contained in