[mythtvnz] Which image format (ISO, BIN etc) shall I use to rip a Blu-Ray disc?

[lists at whitehouse.org.nz]

Hi,

Which image format (ISO, BIN etc) shall I use to preserve all information 
from an unencrypted Blu-Ray disc?

I have a Blu-Ray copy of my wedding video (in addition to a DVD) in H.264 
1080p, to which I own all relevant copyright (so you can feel safe giving me 
advice). I do not have a Blu-Ray drive, but am borrowing one from a friend. 
While I have the drive, I want to make an image of the disc that preserves it 
in its entirety and could be either burnt to a new BR disc (creating an 
identical copy to the original) or played in MythTV etc.

With the DVD, I made an .iso image. This can be burnt to blank DVDs and 
plays natively in MythTV.

I have been told that for a Blu-Ray disc I need to use a BIN file image in 
order to preserve all relevant information of the disc. I have searched quite 
a lot (see links below) and as far as I can tell, a bin image is a 
bit-for-bit copy of the disc surface, whereas an iso image is a copy of the 
*files* on the disc.
http://answers.yahoo.com/question/index?qid=20061130153208AA1w2qP
http://forums.afterdawn.com/thread_view.cfm/7976
http://club.myce.com/f3/differences-bin-img-iso-images-245082/

As I understand things, if all relevant information on the disc is a file 
(as it is with DVDs), an iso image is sufficient. If some relevant 
information on the disc is not a file (such as copy protection mechanisms on 
Blu-Ray?), I would need a BIN file. I have found that BIN files don't play 
natively in a lot of the programs that I use.

My understanding is that Blu-Ray is just a collection of files in a UDF 
filesystem 
(https://help.ubuntu.com/community/RestrictedFormats/BluRayAndHDDVD). I 
expect that copy protection outside of that filesystem often stops you seeing 
the files. For my wedding Blu-Ray, I can see all of the files and play the 
.m2ts file directly, suggesting to me that the disc is entirely unprotected 
(as it should be). In this case, should an iso image be everything that I 
need?

As a number of things don't work properly with Blu-Rays on Gnu/Linux (eg the 
menus), it is hard to just have a go and test 
(http://www.mythtv.org/wiki/Bluray).

Failing an answer, I guess that I just do a BIN file as well and hedge my 
bets.

I'm a member of the FSF, so you don't need to tell me about the evils of 
Blu-Ray (http://www.bluraysucks.com). (Though I note that most of that 
doesn't apply to DRM-free Blu-Ray discs like mine.)

Thanks in advance for your assistance.

Thanks!

Aaron