How do I open an encrypted locked PDF document

Encrypted PDF documents can be easily decrypted by UniPDF by following this step below:

1. Check if the document is encrypted

   pdfReader, _ := model.NewPdfReader(f)
   isEncrypted, _ := pdfReader.IsEncrypted()
   	

2. If the document is encrypted, call Decrypt to decrypt it using a password

   if isEncrypted {
     documentPassword := "unlockthedoc"
   
     auth, err := pdfReader.Decrypt([]byte(documentPassword))
   
     if !auth {
       return errors.New("Decryption failed")
     }
   }
   	

3. If there's no error, then the document is successfully decrypted and you can continue processing the document.

For a complete example on how to unlock an encrypted PDF document, see this following code example

https://github.com/unidoc/unipdf-examples/blob/master/security/pdf_unlock.go