In a message dated 2/19/2017 8:06:50 A.M. US Mountain Standard Time, mouse at Rodents-Montreal.ORG writes: Maybe if you stick to Adobe's tools. As demonstrated by this thread, it's entirely possible to modify such files, even if the currently-easy ways to do that involve a trip through a completely different representation. I find it astonishing that anyone would seriously call any documented file format read-only. (If PDF/A isn't documented, then IMO it's not suitable for archival under any circumstances. But this thread makes it sound as though it's documented.) /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B ====================== OK .. (correct me if I am gong in the wrong direction) so the important thing is that there is... - data in a format that is readable by others and a description of formats so if needed a reader can be constructed at a later date if needed. -non-commercial tools to access it or have the ability to modify the data in the future for all of time. -a reader/writer can be redone to work under a new operating system since source code is freely available for it? .... yea... makes sense... I do know what I do in any given week here is not necessary for the present but for years and sometimes lifetimes far removed from the present moment. #Ed _www.smecc.org_ (http://www.smecc.org)