![]() #Dvdfab hd decrypter watermark movieVerance claims on their website that, while the watermark is able to survive recording through microphones (such as recording a film in a movie theater with a camcorder), as well as compression and encoding, it is imperceptible to human hearing, and the presence of the watermark does not affect audio quality. The intent is to prevent all copying, both counterfeit copies and legal copies of one's own content (for example, format shifting). If the "AACS watermark" is present in the audio tracks, but no accompanying and matching AACS key is found on the disc, then it is deemed to have been a " rip" made by copying to a second blank Blu-ray Disc.Īs of March 2012, known hardware players which can detect Cinavia watermarks include the PlayStation 3 (began with v3.10 System Software), as well as newer Blu-ray Disc players.Ĭinavia works to prevent copying via the detection of a watermark recorded into the analog audio of media such as theatrical films and Blu-ray Discs. If a "theatrical release" watermark is detected in a consumer Blu-ray Disc audio track, the accompanying video is deemed to have been sourced from a " cam" recording. The Blu-ray Disc implementation of Cinavia is designed to cover two use-cases: the first is the provision of a Cinavia watermark on all movie theater soundtracks released via film distribution networks the second use-case is for the provision of a Cinavia watermark on all Blu-ray Disc releases that points to the presence of an accompanying AACS key. Extraction of the hidden signal is not exact but is based on recovering the convolutional codes through statistical cross-correlation. The watermark is only embedded when certain signal-to-noise ratio thresholds are met and is not available as a continuous signal-the signal must be monitored for a period of time before the embedded data can be detected and recovered. The desired hidden digital data signal is combined in the distortion step using a pre-determined pseudorandom binary sequence for audio frame synchronization and large amounts of forward error correction for the hidden data to be embedded. Each phase discontinuity introduced by the encoder will result in a corresponding pulse of wideband white noise, so a further range of additional distortions are introduced as a noise mitigation strategy to compensate. The signal survives temporal masking and sub-band coding by operating on the fundamental frequency and its subharmonic overtones, and by dealigning the phase relationship between the strongest signal and its subharmonics. On playback, no additional audio filters are used to cover up the distortions and discontinuities introduced. It is intended to survive analog distortions such as the wow and flutter and amplitude modulation from magnetic tape sound recording. It is monaural and not a multichannel codec.Ĭinavia's in-band signaling introduces intentional spread spectrum phase distortion in the frequency domain of each individual audio channel separately, giving a per-channel digital signal that can yield up to around 0.2 bits per second -depending on the quantization level available, and the desired trade-off between the required robustness and acceptable levels of psychoacoustic perceptibility. It is designed to survive digital and analog sound recording and reproduction via microphones, direct audio connections and broadcasting, and does so by using audio frequencies within the hearing range. The watermarking and steganography facility provided by Cinavia is designed to stay within the audio signal and to survive all common forms of audio transfer, including lossy data compression using discrete cosine transform, MP3, DTS, or Ogg Vorbis. In conjunction with the existing Advanced Access Content System (AACS) digital rights management (DRM) inclusion of Cinavia watermarking detection support became mandatory for all consumer Blu-ray Disc players from 2012. Survives psychoacoustic compression models (MP3/Vorbis) and non-destructive audio transformations and filteringĬinavia, originally called Verance Copy Management System for Audiovisual Content ( VCMS/AV), is an analog watermarking and steganography system under development by Verance since 1999, and released in 2010. Multi-dimension: time offset, algorithm choice, frequency shift, pseudo-random number sequence, frequency band : 5, 33Ģ0 MIPS (2-channel, 48 kHz, 16-bit) : 4 Single-channel hearing range stenographic watermark Robust against +/-10% speed variation Wow and flutter 6→2→1 downmixing : 4 ( Learn how and when to remove this template message)Ĩ2-bit embedding keyset, : 5 larger extraction keyset : 7 recovery by fuzzy cross-correlation JSTOR ( May 2012) ( Learn how and when to remove this template message).Please improve this by adding secondary or tertiary sources. This article relies excessively on references to primary sources. ![]()
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