Digital signature get Certification invalid

Hi,
I am trying to add Certified digital signature with no change permission and Set Privilege to print only, the PDF shown “Certification is invalid”.
I tried to Set Privilege to allow print only and then add Certified digital signature with no change permission, the signature has “Certification is invalid” with error “The signature byte range is invalid”
image.png (12.4 KB)

when adding Certified digital signature first then apply Set Privilege, the signature has Certification is invalid with error "support information: SigDict/Contents illegal data”
image.png (11.3 KB)

Can we apply both Certified digital signature and SetPrivilege on an PDF?

@ldinh

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