A family of Microsoft relational database management systems designed for ease of use.
Thank you.
I thought Karl was quite clear in his statement:
"Microsoft so far only offers a meager documentation, which is also somewhat misleading regarding the versions, because it is possible to sign file formats from Access 2013 upwards (apparently even from the unsupported 2007/2010), but only with Access 365, which was the sole version to get the new signing built in."
"... it is possible to sign file formats from Access 2013 upwards (apparently even from the unsupported 2007/2010)..."
So, yes, other accdb formats can be digitally signed.
"... but only with Access 365, which was the sole version to get the new signing built in."
So, yes, you can only implement the version of signing only if you have the appropriate Access 365.
Colin Riddington provides a rather more extensive discussion, but again, nothing that suggests the ability to use earlier versions of Access. I doubt he would have left that out, knowing how thoroughly he does his research.
On the other hand, the MS documentation here does include information on finding and creating self certs in earlier versions. And here it is, the telling statement in this documentation:
"All versions of Access allow you to apply a digital signature to the components in .mdb and .mde database formats. Starting with Access for Microsoft 365 Version 2211, .accdb and .accde database formats are also supported."
To me, that suggests you should probably not anticipate a change to those earlier versions of Access, i.e. prior to MS 365 where it was introduced.
Never say never, of course, but I wouldn't plan future development around the possibility that MS will deviate from prior practice.