TiVo Corporation: Perbedaan antara revisi

'''Macrovision''' adalah sebuah perusahaan yang membuat rencana-recana [[pencegahan perekaman]] elektronis, berdiri pada 1983. Nama ini juga digunakan untuk mengacu pada rencana pencegahan perekaman tertentu yang dikembangkan perusahaan tersebut.

 

 

[[Kaset video]] [[VHS]] atau [[DVD]] (tidak termasuk pemutar [[laserdisc]] atau [[video CD]]) atau kotak kabel/satelit digital yang menerima aliran data ''(data stream)'' yang dikodekan dengan Macrovision akan menyebabkan set [[VCR]] gagal merekam data (kecuali model yang sangat lama, VCR yang sudah dimodifikasi, atau yang disetujui untuk "kegunaan profesional"). Biasanya terlihat sebagai gambar acak seperti halnya saat ''tracking''-nya tidak sempurna, atau gambar akan berubah-ubah antara sangat terang dan gelap.

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[[NTSC]] and other video formats store the video signal as “lines.” A portion of these lines are used for constructing the visible image by transposing them on the screen, but there are approximately 20 to 40 lines outside the visible range that are used for different things in different countries, like [[closed captioning]].

Macrovision inserts pulses into this non-displayed area. These signals cause the [[automatic gain control]] on the recording VCR to compensate for the varying strength. This makes the recorded picture wildly change brightness, rendering it unwatchable. On most televisions, the viewer on the screen sees no effect in ordinary playback of the protected video because the signal is outside the visible area, but some [[Television|TVs]] do not properly blank the vertical retrace and leave dotted white lines near the top of the picture. Some newer TVs also mistake the Macrovision pulses for synchronization pulses.

 

 

===Permasalahan teknis===

In [[June 2005]], Macrovision sent a [[cease and desist]] letter to "Lightning UK!", the maker of [[DVD Decrypter]], a program that allows users to backup their DVDs by bypassing [[Content-scrambling system|CSS]] and Macrovision protection, which can also be used for piracy. They later acquired the rights to this software and withdrew it from circulation on the internet.

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*[http://www.repairfaq.org/filipg/LINK/F_MacroVision.html Fil's FAQ-Link-In Corner: MacroVision FAQ]

*[http://www.mpaa.org/DVD_FAQ.asp MPAA | DVD Frequently Asked Questions]

*[http://columbiaisa.freespaces.com/dvd_macrovision2.htm Columbia ISA: Macrovision Details]

 

* [[Content Scrambling System|CSS]] dan [[DeCSS]]

* [[Pencegahan perekaman]]

* [[SafeCast]] - Skema perlindungan perekaman perangkat lunak Macrovision (diturunkan dari [[FLEXlm]])

 

*{{en}}[http://www.macrovision.com/ Macrovision | Situs web]

*{{en}}[http://electronics.howstuffworks.com/question313.htm Howstuffworks: "How does copy protection on a video tape work?"]

 

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[[Kategori:Perusahaan]]