I've use TCPDF library to sign the pdf. The result is okay, but when i validate on difference computer(with adobe acrobat), it's tell me that Signature Validity is UNKNOWN the signer's identity is unknown because it has not been included in your list if trusted identities and none of its parent certificates are trusted identities. (cannot found certification path)
How to make other computer found my cert even if not install my certificate?
i'm already bought cert from my CA...
What is the cause of the problem and how can i fix this.
This is my example signed file here
