Using Lexar Secure II equipped USB sticks?
If you are, you might want to think about it again. But only if you're eager to ever watch a DVD on your Mac again. Strange bug, this. MacBidouille reports this
(in French): The security software found on the Lexar USB sticks, if activated, installs "LexarFilterScheme.kext". After that kernel extension is loaded and you feed your Mac a commercial video DVD, the Mac simply says it cannot read the disk and asks you to "ignore" or "eject" the disk. Get rid of the extension, and you're good again. Lexar's website
does not mention the bug yet. But maybe they will some day release an update.
For those who still want to encrypt files on a USB stick on the fly: Simply create a secure disk image on the stick's volume using Disk Utility. Mac OS X has
software for encryption, after all.