Movie dvd not recognized on this computer

I am getting this alert message, "The disk you inserted was not readable by this computer" when I insert a commercial movie DVD. Was working last week, why not now?

     I finally searched google with the original error message and discovered other Apple community  discussions... sure enough I had the Lexar Securell USB software installed recently...
     I removed the Lexar extensions from /System/Library/Extensions, did a restart and all is fine again.
     I discontinued use of the software a while back because nobody would allow me to load the software on their machines to allow decryption... guess that should have been a first warning something was amiss.
     Does this software qualify as a virus seeing that it would have gotten passed along to other machines and left others not able to use their DVD drives, yikes!!!!!!!!! Bad, Bad Lexar, Bad!
     Think this warrents a general net-wide alert!!
EL

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