RoboHelp X5 was the last eHelp version and was ever so briefly rebranded by macromedia. There is no way that Adobe would be involved in providing any digital signature for those old files.
While I'm unsure as to the version where it began, I do believe that those files no longer exist in WebHelp output, so digital signatures should be moot.
Hi, thanks for the response. Adobe confirmed that they have not used these files from version 7.