Use Classes for secure actionscript

Hi everyone,
It’s been a while since I posted but here I go.
I have been examining how people structure their Flash movies by decompiling them and looking at tweens and actionscript.
I noticed some decompiled SFF’s didn’t work…images weren’t onstage etc.
I think this is due to their use of OOP and Classes.
Is it true that people can’t decompile these self-consructed objects that are linked through the prefernces panel. If so, is thi sthe best way to stop people stealing code etc.
I know you can get encryption software but this adds kb’s to the movi ewhich would be undesirable and I don’t think that companies would want this.

Thanks in ad…

The Modelreject