I have been using EOC to encrypt about few hundred files but with much regret, I had lost 2 of my video files due to error in description. Both files are above 700M.
Meanwhile, there is no problem for small files but for the larger ones (few hundred M), I recommend you to duplicate your files before any encryption/description, if you are using EOC.
The software developer responded to this review on Jan 03, 2008:
We re not aware of any problems with large files (the EOC files are Zip64 files using 256-bit AES encryption, and have no size limit). Please feel free to contact us if there are any problems.