ARccOS is a copy-protection system developed by Sony used on some DVDs. Designed as an additional form of copy protection, it is used in conjunction with Content Scramble System (CSS). The system deliberately creates a number of sectors on the DVD with corrupted data that cause DVD copying software to produce errors. Normal DVD players never read these sectors since they follow a set of instructions encoded on the disc telling them to skip them. Less sophisticated DVD copying programs do not follow these instructions and instead try to read every sector on the disk sequentially, including the bad ones. Slysoft's AnyDVD, Fengtao's DVDFab Decrypter, RipIt4Me + DVD Decrypter + FixVTS, MacTheRipper (freeware), along with VLC media player and MPlayer/MEncoder (for Linux) are usually able to overcome ARccOS protection.
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Inverse trigonometric function
In mathematics, the inverse trigonometric functions are the inverse functions of the trigonometric functions. The principal inverses are listed in the following table.If x is allowed to be a complex number, then the range of y applies only to its real part.The notations sin−1, cos−1, etc are often used for arcsin, arccos, etc, but this notation causes confusion, e.g. between arcsin(x) and 1/sin(x).
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