How to lock versions to prevent inadvertent modification?

When I process valuable images in Aperture I like to use versions to capture different stages of the editing process. From such a version I may then derive one or more further variants either for different purposes or for comparison of different processing options. At some point I obtain one or more versions that I consider final. It would be very useful to be able to lock or "freeze" versions (not only the final ones) in that procedure in order to prevent them from being inadvertently modified.
I could not figure out how to do that, does anybody have a solution?
Thanks for any advice.

Thanks for the colour coding hint Léonie and Kirby Krieger. This can probably alleviate the issue and I will try it out (and provide Apple feedback).
I certainly agree with the remarks on the relativity of the "final" attribute. In any case for me the locking feature would be of more value for intermediate versions in which certain adjustments have been finalised but more work is necessary. I have the situation that starting from an intermediate version I want to compare several alternatives of rather subtle further adjustments, each of which, however, may take (me) quite some time to perform. When looking at the different alternatives in the browser view, they are so similar that you hardly can distinguish them. Here it may easily happen that when one wants to continue to work, the wrong version is selected and you do not realise immediately. This may be particularly relevant when the work had to be interrupted for quite some time. Again I admit that systematic usage of color coding can help.
May be that my desire for a locking feature relates to my experience in the software field where you certainly want (and usually have the ability) to freeze your digital assets when you consider them to be in state that you want keep or return to, independent of whether you later derive further versions from those frozen assets. To me this appears to be a reasonable mechanism for any kind of digital asset library, even if it does not require too much time to recover from accidental changes.
Regards
Philippe

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