Another thread addresses the question of what can count as "military-grade encryption." In this case, I see that CyberLink Power2Go software boasts "advanced military-grade 256-bit encryption." TechRadar clarifies that Power2Go uses AES-256.
The Power2Go webpage says that the software is useful for "movie disc authoring" and for burning data discs. The page refers to encryption only in connection with data discs, not movie discs.
I am interested in burning data files to Blu-ray disc. My question is whether I would achieve comparable practical security by encrypting data files via Power2Go instead of encrypting them before burning, using something like 7-Zip or WinRAR.
The latter have some advantages. They seem more dedicated to security. In the case of 7-Zip, I could include a working portable copy on the disc, as a precaution against the day when relevant software is no longer available. I haven't used Power2Go, but I assume 7-Zip and WinRAR would offer more compression options. The files would be encrypted even when they weren't on the Blu-ray disc. I wouldn't have to bring the unfamiliar Power2Go software into the mix. I'm not sure whether I could retrieve the files from the disc if, say, Power2Go failed to work on some hardware, or in some future version of Windows.
My primary concern is whether encryption in disc-burning software can be legitimate. The Power2Go webpage seems to say that data on a BD-R can be protected, when movies on a BD-R are vulnerable to ripping. I don't believe the disc-burning software I've used offers encryption - which leads me to wonder whether this is something of a gimmick. Certainly it could be convenient to use a one-step Power2Go solution when burning a stack of BD-Rs, so as to eliminate a separate (7-Zip or WinRAR) encryption phase.