Questions for LTV display problems!

[Riona343472847f42]

I'm currently using a non-LTV timestamping service but when I open a file in Adobe AcrobatReader, it shows as LTV enabled. What could be the cause of this problem?

And I have one more question.

Using a same file and open it in Adobe AcrobatReader, one shows LTV enabled and other is non-LTV. this happens sometimes depending on the person, please let me know the cause of this as well.

Thanks for your help!

[Abambo]

What is an LTV-display?

[ls_rbls]

I believe the Op is referring to the long-term validity of the signed agreements.

[ls_rbls]

@Riona343472847f42 ,

Have you checked this guidance ?

• https://helpx.adobe.com/sign/config/time-stamp-settings/overview.html
• https://helpx.adobe.com/acrobat/using/validating-digital-signatures.html

[Aoi35050081ungj]

I checked them, but there were not enough information about LTV.

I want to know how the system decide whether or not a file is LTV available.

[ls_rbls]

Hi @Aoi35050081ungj ,

To learn how the system decide wether or not a file is LTV involves different steps from the moment the signature was created and assigning the required chain of trust mechanisms to the certificate-based signature at signing time.

Doing so, will ensure (or at least in theory) that the signed document will remain valid and verifiable past the lifetime of the embedded time-stamp of that certificate-based digital signature .

I would say that it is not the system that decides, but a series of standards and PDF specifications that define the mechanisms that will verify or enforce the validity of a signed document.

This is explained in more detail in the links that I am sharing below, in particular this discussion:

• What is ESTI PAdES? | Ascertia | Blog

Which complements the second link that I posted earlier for the OP: Validating digital signatures, Adobe Acrobat and also complements this link: Long-Term Validation (LTV) of PDF Digital Signatures in Adobe Acrobat - SSL.com

See more in-depth information here:

• ETSI - TS 102 778-3 - Electronic Signatures and Infrastructures (ESI); PDF Advanced Electronic Signa...

• TS 102 778-1 - V1.1.1 - Electronic Signatures and Infrastructures (ESI); PDF Advanced Electronic Sig...

• Long-Term Validation of Signatures – PDF Association