Long Term Validation

[lsnepomuceno]

I would suggest that digital signatures follow the LTV standard.

It is currently possible to enter only a single digital signature, the second onwards overwrites the previous ones.

Thanks.

[parallels999]

It is currently possible to enter only a single digital signature, the second onwards overwrites the previous ones.

@lsnepomuceno what about https://github.com/dealfonso/sapp?

[williamdes]

How different is this from #617

Please explain to me the feature

[pr-apes]

@lsnepomuceno,

I suggest you report LTV to be incorporated in https://github.com/tecnickcom/tc-lib-pdf (TCPDF is in support only mode).

As for the single signature, it has to do with the kind of signature TCPDF uses.

It is a certification signature (not a approval signature).

PDF documents allow as many approval signatures as desired, but only a single certification signature per document.

https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf#page=475 explains this.

I think it might make sense to close the report, since LTV is not an already supported feature and certification signatures are the way TCPDF enables digital signing.

Many thanks for your report.

[FuriosoJack]

Actualmente sólo es posible introducir una única firma digital, a partir de la segunda sobrescribe las anteriores.

@lsnepomuceno¿Qué pasa con https://github.com/dealfonso/sapp ?

I was using tcpd but after doing a couple of tests I think this is the best option