LockBlocks
(Dinamic Multimedia)

History:
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How it works?
The LockBlocks protection is based in unreadable sectors. All CD's which are protected with LockBlocks seem to have 2 visible circles, one about 5 mm, the other 3 mm, which causes lockups to CD-Rom when trying to read it.

Price: Not available (at website)

How to recognize it:
Check for two visible rings (one thin ring and one thicker one) on the "data side" of the original CD.

Does it work in real life?
Not so effectively since with an good software which had good skip errors machine (CloneCD, BlindRead) can <backup> the CD.