2. This is a problem with the PDF reader. Just change the reader.

3. Enter the online business registration page. When submitting a PDF form, if you encounter the prompt "There is something wrong with at least one signature", it is because the certificate you signed is not credible. Click the "Signature Properties-Show Signer Certificates-Trust-Add to Trusted Certificates" function that you signed in the PDF document to add all signed certificates to trusted certificates, and then try the operation again.

Extended data:

PDF files use industry standard compression algorithms, which are usually smaller than PostScript files and easier to transmit and store. It is also page independent. A PDF file contains one or more "pages", which can handle each page independently, especially suitable for multiprocessor systems.

In addition, a PDF file also contains the PDF version used in the file and the positioning information of some important structures in the file. It is precisely because of its various advantages that PDF files have gradually become the new favorite of the publishing industry.