HDCP protocol

   HDCP is the abbreviation of High-bandwidth Digital Content Protection, which can be called "HDCP Digital Content Protection" in Chinese. HDCP technology was developed by Hollywood in cooperation with the semiconductor giant Intel. It can be applied to the transmission end of graphics cards, DVD players, and the receiving end of monitors, TVs, and projectors. It is an important anti-piracy technology for high-definition movies and TV programs. Monitors that do not support the HDCP protocol cannot play copyrighted high-definition programs normally.

    HD movie programs after DVD use HDCP and AACS anti-piracy technology, Blu-ray and HD DVD both use this anti-piracy technology, and high-definition television (HDTV) will also use this anti-piracy technology. After using HDCP and AACS anti-piracy technology, movie programs can only be played normally on devices that support HDCP, otherwise you can only see a black screen display or a low-quality display (the resolution is only about one-fourth of the normal). Lost the value of HD. Among them, AACS is an encryption technology, which is also used in HD DVD and Blu-ray discs to protect the video content in the disc from being normally copied and played in other places.

    The HDCP protocol is used to prevent video content from being completely copied during transmission. This technology is not to prevent the digital signal from being illegally recorded, but to encrypt the digital signal so that the illegal recording method cannot achieve the original high-resolution image quality. For example, the Blu-ray disc player cannot record clear programs at the same time when playing high-definition discs, and cannot clearly record the programs on the monitor when playing the discs on the computer. HDCP protects the video signal from start to finish, which means that every link in the entire playback system must support the HDCP protocol. If the monitor does not support the HDCP protocol, then the HD program cannot be played normally, and only a black screen or low image quality can be seen. Show. To support the HDCP protocol, digital video interfaces such as DVI and HDMI must be used, and traditional analog signal interfaces such as VGA cannot support the HDCP protocol. When using an analog signal interface such as VGA, the picture will drop to low picture quality, or it will be prompted that it cannot be played, thus losing the meaning of high definition and preventing piracy. It should be noted that the HDMI interface is embedded with the HDCP protocol, and displays with the HDMI interface support the HDCP protocol. However, not all LCD monitors with DVI interface support the HDCP protocol, and must pass through a certified monitor with a corresponding hardware chip.

    The data content protected by HDCP technology on the computer platform will be output by the COPP driver (Certified Output Protection Protocol) in the operating system to first verify the graphics card. Only legal graphics cards can achieve content output, and then the key of the display device must be authenticated. Only devices that meet the HDCP requirements can finally display the content transmitted by the graphics card. During HDCP transmission, both the sender and receiver store a set of available keys. These keys are stored secretly. Both the sender and receiver perform encryption and decryption operations based on the keys. A special feature must be added to such operations. Value KSV (Video Encryption Key). At the same time, each device of HDCP will have a unique KSV serial number, and the cryptographic processing unit of the sender and receiver will check each other's KSV value to ensure that the connection is legal. The HDCP encryption process will process each pixel, making the picture irregular and unrecognizable. Only after confirming the synchronization can the sender and receiver perform reverse processing to complete data restoration. In the decryption process, the HDCP system will confirm the connection every 2 seconds, and at the same time, perform the synchronization identification code of the sender and the receiver every 128 frames to ensure the synchronization of the connection. In order to deal with the situation of key leakage, HDCP has specially established a "revocation key" mechanism. The key set KSV value of each device is unique. The HDCP system will compare and look up the KSV value in the revocation list after receiving the KSV value. The KSV that appears in the list will be regarded as illegal, causing the authentication process to fail. The revocation key list here will be included in the multimedia data corresponding to HDCP and will be updated automatically.

    It can be seen that in order to play copyrighted high-definition programs on the computer, whether it is HDTV, Blu-ray or HD DVD discs, the display and graphics card must support the HDCP protocol. However, if manufacturers want to put the HDCP logo on their products, they need to pay a certain certification fee and increase the hardware chip, which obviously increases the cost. At present, only some products have passed the certification. As high-definition programs will gradually become popular and HDCP is a foregone conclusion, there will be more and more devices supporting the HDCP protocol.

 

 

 

How far(long) the transmitter cover? The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far. EXAMPLE 5W FM Transmitter use in the city and hometown: I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile). I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile). I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft). Below are the approximate range of different power FM Transmitters. ( The range is diameter ) 0.1W ~ 5W FM Transmitter ：100M ~1KM 5W ~15W FM Ttransmitter : 1KM ~ 3KM 15W ~ 80W FM Transmitter : 3KM ~10KM 80W ~500W FM Transmitter : 10KM ~30KM 500W ~1000W FM Transmitter : 30KM ~ 50KM 1KW ~ 2KW FM Transmitter : 50KM ~100KM 2KW ~5KW FM Transmitter : 100KM ~150KM 5KW ~10KW FM Transmitter : 150KM ~200KM How to contact us for the transmitter? Call me +8618078869184 OR Email me [email protected] 1.How far you want to cover in diameter ? 2.How tall of you tower ? 3.Where are you from ? And we will give you more professional advice. About Us FMUSER.ORG is a system integration company focusing on RF wireless transmission / studio video audio equipment / streaming and data processing .We are providing everything from advice and consultancy through rack integration to installation, commissioning and training.   We offer FM Transmitter, Analog TV Transmitter, Digital TV transmitter, VHF UHF Transmitter, Antennas, Coaxial Cable Connectors, STL, On Air Processing, Broadcast Products for the Studio, RF Signal Monitoring, RDS Encoders, Audio Processors and Remote Site Control Units, IPTV Products, Video / Audio Encoder / Decoder, designed to meet the needs of both large international broadcast networks and small private stations alike.   Our solution has FM Radio Station / Analog TV Station / Digital TV Station / Audio Video Studio Equipment / Studio Transmitter Link / Transmitter Telemetry System / Hotel TV System / IPTV Live Broadcasting / Streaming Live Broadcast / Video Conference / CATV Broadcasting system.   We are using advanced technology products for all the systems, because we know the high reliability and high performance are so important for the system and solution . At the same time we also have to make sure our products system with a very reasonable price.   We have customers of public and commercial broadcasters, telecom operators and regulation authorities , and we also offer solution and products to many hundreds of smaller, local and community broadcasters .   FMUSER.ORG has been exporting more than 15 years and have clients all over the world. With 13 years experience in this field ,we have a professional team to solve customer's all kinds of problems. We dedicated in supplying the extremely reasonable pricing of professional products & services. Contact email : [email protected] Our Factory We have modernization of the factory . You are welcome to visit our factory when you come to China. At present , there are already 1095 customers around the world visited our Guangzhou Tianhe office . If you come to China , you are welcome to visit us . At Fair This is our participation in 2012 Global Sources Hong Kong Electronics Fair . Customers from all over the world finally have a chance to get together. Where is Fmuser ? You can search this numbers " 23.127460034623816,113.33224654197693 " in google map , then you can find our fmuser office . FMUSER Guangzhou office is in Tianhe District which is the center of the Canton . Very near to the Canton Fair , guangzhou railway station, xiaobei road and dashatou , only need 10 minutes if take TAXI . Welcome friends around the world to visit and negotiate . Contact: Sky Blue Cellphone: +8618078869184 WhatsApp: +8618078869184 Wechat: +8618078869184 E-mail: [email protected] QQ: 727926717 Skype: sky198710021 Address: No.305 Room HuiLan Building No.273 Huanpu Road Guangzhou China Zip:510620 English: We accept all payments , such as PayPal, Credit Card, Western Union, Alipay, Money Bookers, T/T, LC, DP, DA, OA, Payoneer, If you have any question , please contact me [email protected] or WhatsApp +8618078869184 PayPal.  www.paypal.com We recommend you use Paypal to buy our items ,The Paypal is a secure way to buy on internet . Every of our item list page bottom on top have a paypal logo to pay. Credit Card.If you do not have paypal,but you have credit card,you also can click the Yellow PayPal button to pay with your credit card. --------------------------------------------------------------------- But if you have not a credit card and not have a paypal account or difficult to got a paypal accout ,You can use the following: Western Union.  www.westernunion.com   Pay by Western Union to me : First name/Given name: Yingfeng Last name/Surname/ Family name: Zhang Full name: Yingfeng Zhang Country: China City: Guangzhou  --------------------------------------------------------------------- T/T .  Pay by T/T (wire transfer/ Telegraphic Transfer/ Bank Transfer)  First BANK INFORMATION (COMPANY ACCOUNT): SWIFT BIC: BKCHHKHHXXX Bank name: BANK OF CHINA (HONG KONG) LIMITED, HONG KONG Bank Address: BANK OF CHINA TOWER, 1 GARDEN ROAD, CENTRAL, HONG KONG BANK CODE: 012 Account Name : FMUSER INTERNATIONAL GROUP LIMITED Account NO. : 012-676-2-007855-0 --------------------------------------------------------------------- Second BANK INFORMATION (COMPANY ACCOUNT): Beneficiary: Fmuser International Group Inc Account Number: 44050158090900000337 Beneficiary's Bank: China Construction Bank Guangdong Branch SWIFT Code: PCBCCNBJGDX Address: NO.553 Tianhe Road, Guangzhou, Guangdong,Tianhe District, China **Note: When you transfer money to our bank account, please DO NOT write anything in the remark area, otherwise we won't be able to receive the payment due to government policy on international trade business. * It will be sent in 1-2 working days when payment clear. * We will send it to your paypal address. If you want to change address, please send your correct address and phone number to my email [email protected] * If the packages is below 2kg,we will be shipped via post airmail, it will take about 15-25days to your hand. If the package is more than 2kg,we will ship via EMS , DHL , UPS, Fedex fast express delivery,it will take about 7~15days to your hand. If the package more than 100kg , we will send via DHL or air freight. It will take about 3~7days to your hand. All the packages are form China guangzhou. * Package will be sent as a "gift" and declear as less as possible,buyer don't need to pay for "TAX". * After ship, we will send you an E-mail and give you the tracking number. For Warranty . Contact US--->>Return the item to us--->>Receive and send another replace . Name: Liu xiaoxia Address: 305Fang HuiLanGe HuangPuDaDaoXi 273Hao TianHeQu Guangzhou China. ZIP:510620 Phone: +8618078869184 Please return to this address and write your paypal address,name,problem on note:

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