Comment Re:yawn - hard to do, expensive to run: no yawn (Score 1) 337
If the system is well designed. I'm oversimplifying this but imagine that the watermark is a particular series of color variation on certain colors. You don't know the colors and you don't know the variations. Moreover, you don't know on which frames they appear.
Throw in a series of random variations in colors (who don't affect the visual perception in a sensitive way) and you have yourself a nice problem.
If done right, removing the watermark is really a decryption problem. Not impossible, but very very hard to crack and then computationally expensive: think about how long it takes to rip just one DVD now you are looking at at least 4-5 passes over this data (I'm being super optimistic here).
It would complicate things a great deal really if you really want to remove it.
Throw in a series of random variations in colors (who don't affect the visual perception in a sensitive way) and you have yourself a nice problem.
If done right, removing the watermark is really a decryption problem. Not impossible, but very very hard to crack and then computationally expensive: think about how long it takes to rip just one DVD now you are looking at at least 4-5 passes over this data (I'm being super optimistic here).
It would complicate things a great deal really if you really want to remove it.
