CN111586491A - Method and system for preventing disclosure and tracing of WeChat public number video - Google Patents
Method and system for preventing disclosure and tracing of WeChat public number video Download PDFInfo
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- CN111586491A CN111586491A CN202010401886.6A CN202010401886A CN111586491A CN 111586491 A CN111586491 A CN 111586491A CN 202010401886 A CN202010401886 A CN 202010401886A CN 111586491 A CN111586491 A CN 111586491A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
- H04N21/8358—Generation of protective data, e.g. certificates involving watermark
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
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Abstract
The invention relates to the technical field of video transmission and tracing, and discloses a method for preventing disclosure and tracing of WeChat public number video, which comprises the following steps: s1: identifying a client type on which the current WeChat public number is based; if the client type based on the current WeChat public number is the WeChat Windows version, performing watermark superposition on the video according to the WeChat Windows version watermark superposition flow; if not, judging whether the client type based on the current WeChat public number is a WeChat IOS version or a WeChat Mac OS version; if so, performing watermark superposition on the video in the WeChat public number according to a watermark superposition process of the first mobile terminal; and if not, performing watermark superposition on the video in the WeChat public number according to a watermark superposition process of the second mobile terminal. By adopting the method, after the video of the WeChat public number is recorded, the responsibility tracing can be carried out through the watermark on the video.
Description
Technical Field
The invention belongs to the technical field of video transmission and tracing, and particularly relates to a method and a system for preventing disclosure and tracing of WeChat public number videos.
Background
The internet is developed rapidly, and users can transmit and share audio, images or videos and other types of files through various intelligent terminals or PC terminals at any time and any place, so that convenience is brought to people, and meanwhile, a serious challenge is brought to intellectual property protection.
For a training education institution specially aiming at online teaching, namely, a training education institution mainly aiming at an online course, if students of the training education institution record and transmit video contents when watching videos, intellectual property interests of the training education institution can be damaged, and simultaneously, persons to be blamed cannot be traced back.
Although video leakage and malicious transmission events cannot be immediately prevented, video watermarking can be used as an information tracing technology, whether video data are protected or not can be judged, transmission of the protected video data is monitored, authenticity is identified, leakage disputes are solved, and evidences are provided for judicial departments, so that the video watermarking playing an extremely important role in video information safety.
The method is characterized in that the traditional watermarking technology is applied, the simplest method is that watermarking is added in software and streaming is coded, so that video playing is required in a special application program, the video playing is not bound with user behaviors, the watermarking content is inflexible, the video playing is carried out through the application program, many scenes cannot be applied, for example, a large screen of a PC (personal computer) end, for online course teaching, the targeted audience is large, and therefore the video watermarking superposition needs to be carried out on different scenes, and the comprehensive protection of the online course video is achieved.
Disclosure of Invention
The invention aims to provide a method and a system for video anti-disclosure and tracing of a WeChat public number, which are used for solving the problems that the existing video watermarking method in the WeChat public number is troublesome in operation, inflexible in watermarking and cannot be applied to video watermarking of different scenes.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a method for wechat public number video anti-disclosure and tracing, comprising the steps of:
s1: identifying the client type based on the current WeChat public number through a user agent, wherein the client type comprises a WeChat Windows version, a WeChat IOS version and a WeChat Mac OS version;
s2: if the client type based on the current WeChat public number is the WeChat Windows version, performing watermark superposition on the video in the WeChat public number according to the WeChat Windows version watermark superposition process;
s3: if the client type based on the current WeChat public number is not the WeChat Windows version, judging whether the client type based on the current WeChat public number is the WeChat IOS version or the WeChat Mac OS version;
s4: if the client type based on the current WeChat public number is a WeChat IOS version or a WeChat Mac OS version, performing watermark superposition on a video in the WeChat public number according to a first mobile terminal watermark superposition process;
s5: and if the client type based on which the current WeChat public number is not the WeChat IOS version or not the WeChat Mac OS version, performing watermark superposition on the video in the WeChat public number according to a second mobile terminal watermark superposition process.
Further, step S1 is preceded by the steps of:
verifying whether the WeChat public number obtains authorization;
if the WeChat public number is authorized, verifying whether the WeChat public number is bound with the mobile phone number; if the WeChat public number is not authorized, continuing to verify;
if the WeChat public number is bound with the mobile phone number, executing the step S1; if the WeChat public number is not bound with the mobile phone number, requesting the client to bind the mobile phone number;
further, the process of superimposing the WeChat Windows version watermark in step S2 includes the steps of:
s21: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s22: floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
s23: and adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index.
Further, the first mobile terminal watermark superposition process in step S4 includes the steps of:
s41: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s42: generating a subtitle watermark by the generated digital watermark according to a preset time line;
s43: and loading the WebVTT caption through Track, and displaying the caption watermark on a video interface through a preset position and a preset line.
Further, step S43 further includes the steps of:
s431: loading a WebVTT subtitle through Track, and displaying a subtitle watermark on a video interface through a preset position and a preset line;
s432: monitoring whether the subtitle watermark is closed or not according to preset monitoring time through a preset script;
s433: if closed, the switch is forced to be opened.
Further, the second mobile terminal watermark superposition process in step S5 includes the steps of:
s51: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s52: acquiring the width and height of a window of a mobile terminal corresponding to a current client;
s53: correspondingly setting the width and the height of a video player according to the obtained width and the height of the window of the mobile terminal;
s54: floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
s55: and adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index.
A system for wechat public number video anti-disclosure and traceability tracking, comprising:
the client type identification module is used for identifying the client type based on the current WeChat public number through a user agent, wherein the client type comprises a WeChat Windows version, a WeChat IOS version and a WeChat Mac OS version;
the WeChat Windows edition watermarking module is used for performing watermarking superposition on the video in the WeChat public number according to a WeChat Windows edition watermarking superposition flow when the type of the client based on the WeChat public number is the WeChat Windows edition;
the WeChat apple edition watermarking module is used for performing watermarking superposition on videos in the WeChat public number according to a first mobile terminal watermarking superposition process when the type of a client based on the WeChat public number is a WeChat IOS edition or a WeChat Mac OS edition;
and the WeChat android version watermarking module is used for performing watermarking superposition on the video in the WeChat public number according to a second mobile terminal watermarking superposition process when the type of the client based on the WeChat public number is not the WeChat IOS version or not the WeChat Mac OS version.
Further, the WeChat Windows version watermarking module comprises:
the first watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
the watermark superposition video unit is used for floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
and the display position adjusting unit is used for adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index.
Further, the WeChat apple version watermarking module comprises:
the second watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
a caption watermark generating unit for generating a caption watermark from the generated digital watermark according to a preset time line;
and the caption watermark display unit is used for loading the WebVTT caption through Track and displaying the caption watermark on the video interface through a preset position and a preset line.
Further, WeChat android version adds watermark module still includes:
the third watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
and the pseudo-full screen generating unit is used for acquiring the width and height of the window of the mobile terminal corresponding to the current client, and correspondingly setting the width and height of the video player according to the acquired width and height of the window of the mobile terminal.
The invention comprises at least the following beneficial effects:
(1) the watermarking of the WeChat public number video can be carried out on the WeChat Windows version, the WeChat IOS version, the WeChat Mac OS version and the WeChat android version respectively, and the purpose that students can carry out information responsibility tracing through the mobile phone numbers of the students when recording and transmitting the video content when watching the video is achieved.
(2) The superposition of video watermarks can be realized without downloading the APP, so that the video watching is more convenient.
(3) The time of the generated watermark on the video is random, so that a way that a student traces back to a time period when the video is recorded to avoid the watermark and a way of avoiding the position of the watermark can be ensured, and the security of the anti-disclosure of the WeChat public number video is ensured.
Drawings
FIG. 1 is a block diagram of a flow chart of the method for WeChat public video anti-disclosure and tracing;
fig. 2 is a block diagram of the system for wechat public number video anti-disclosure and tracing.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, and the technical solutions of the present invention are not limited to these embodiments.
Example one
The embodiment provides a method for preventing disclosure and tracing of wechat public number video, as shown in fig. 1, the method includes:
s1: identifying the client type based on the current WeChat public number through a user agent, wherein the client type comprises a WeChat Windows version, a WeChat IOS version and a WeChat Mac OS version;
s2: if the client type based on the current WeChat public number is the WeChat Windows version, performing watermark superposition on the video in the WeChat public number according to the WeChat Windows version watermark superposition process;
s3: if the client type based on the current WeChat public number is not the WeChat Windows version, judging whether the client type based on the current WeChat public number is the WeChat IOS version or the WeChat Mac OS version;
s4: if the client type based on the current WeChat public number is a WeChat IOS version or a WeChat Mac OS version, performing watermark superposition on a video in the WeChat public number according to a first mobile terminal watermark superposition process;
s5: and if the client type based on which the current WeChat public number is not the WeChat IOS version or not the WeChat Mac OS version, performing watermark superposition on the video in the WeChat public number according to a second mobile terminal watermark superposition process.
Further, step S1 is preceded by the steps of:
verifying whether the WeChat public number obtains authorization;
if the WeChat public number is authorized, verifying whether the WeChat public number is bound with the mobile phone number; if the WeChat public number is not authorized, continuing to verify;
if the WeChat public number is bound with the mobile phone number, executing the step S1; if the WeChat public number is not bound with the mobile phone number, requesting the client to bind the mobile phone number;
the specific flow is that a student logs in the network course WeChat public number in a WeChat mode, the WeChat public number obtains the authorization of the client, then the mobile phone number of the student is bound, the information of the student is recorded into the system for video anti-disclosure and tracing of the WeChat public number, and at the moment, the student can generate the current watermark information of the student in the last six bound mobile phones of the student in the process of watching the video. The last six-digit information of the mobile phone number has the uniqueness of the user.
The video element in the mobile browser is more special, and in the early days, no matter in the browser of iOS or Android, the video element is located at the topmost layer of the page and cannot be shielded. The video player and the playing source are both provided by the Tencent cloud. Because the Tencent video player is not open source, all technical schemes are implanted into the player in a plug-in mode.
Further, the process of superimposing the WeChat Windows version watermark in step S2 includes the steps of:
s21: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s22: floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
s23: and adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index.
And randomly floating the content of the dynamic watermark on the played video through the css, and adjusting the display positions of the video and the dynamic watermark through the z-index.
Further, the first mobile terminal watermark superposition process in step S4 includes the steps of:
s41: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s42: generating a subtitle watermark by the generated digital watermark according to a preset time line;
s43: and loading the WebVTT caption through Track, and displaying the caption watermark on a video interface through a preset position and a preset line.
Further, step S43 further includes the steps of:
s431: loading a WebVTT subtitle through Track, and displaying a subtitle watermark on a video interface through a preset position and a preset line;
s432: monitoring whether the subtitle watermark is closed or not according to preset monitoring time through a preset script;
s433: if closed, the switch is forced to be opened.
The dynamic watermark under the IOS version is realized based on WEBVTT, WEBVTT subtitles are introduced through track, subtitles are dynamically generated through random time lines of unique information of a current authorized login user, and identification information is randomly arranged in a playing interface through random position and random line. Whether the subtitles are closed or not is monitored in a playing page regularly through the script, the subtitles can be forcibly opened after the subtitles are closed, and the scheme has good experience under the IOS equipment.
Further, the second mobile terminal watermark superposition process in step S5 includes the steps of:
s51: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s52: acquiring the width and height of a window of a mobile terminal corresponding to a current client;
s53: correspondingly setting the width and the height of a video player according to the obtained width and the height of the window of the mobile terminal;
s54: floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
s55: and adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index.
The second mobile terminal watermark superposition process is used for superposing the WeChat public number video watermark with the client type of WeChat Android version; the Android version dynamic watermark is based on a peer scheme provided by a WeChat X5 kernel browser, a special video element of a peer player is used for solving the shielding problem, the width and the height of the video player are set to be the same as the size of a mobile terminal window, namely a mobile phone window, by a video player in the WeChat public number, so that the effect of pseudo-full screen of the video in the WeChat public number is achieved, the shielding problem is solved, and then a WeChat Windows version watermark superposition flow is adopted for carrying out watermark superposition on the pseudo-full screen video.
By adopting the method, the watermarking of the WeChat public number video can be respectively carried out on the WeChat Windows version, the WeChat IOS version, the WeChat Mac OS version and the WeChat android version, and the aim of tracing the information responsibility of the student through the student's mobile phone number when the student records and transmits the video content when watching the video is fulfilled.
Example two
The embodiment provides a system for preventing disclosure and tracing of wechat public number video, as shown in fig. 2, the system includes:
a system for wechat public number video anti-disclosure and traceability tracking, comprising:
the client type identification module is used for identifying the client type based on the current WeChat public number through a user agent, wherein the client type comprises a WeChat Windows version, a WeChat IOS version and a WeChat Mac OS version;
the WeChat Windows edition watermarking module is used for performing watermarking superposition on the video in the WeChat public number according to a WeChat Windows edition watermarking superposition flow when the type of the client based on the WeChat public number is the WeChat Windows edition;
the WeChat apple edition watermarking module is used for performing watermarking superposition on videos in the WeChat public number according to a first mobile terminal watermarking superposition process when the type of a client based on the WeChat public number is a WeChat IOS edition or a WeChat Mac OS edition;
and the WeChat android version watermarking module is used for performing watermarking superposition on the video in the WeChat public number according to a second mobile terminal watermarking superposition process when the type of the client based on the WeChat public number is not the WeChat IOS version or not the WeChat Mac OS version.
Further, the WeChat Windows version watermarking module comprises:
the first watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
the watermark superposition video unit is used for floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
and the display position adjusting unit is used for adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index. Further, the WeChat apple version watermarking module comprises:
the second watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
a caption watermark generating unit for generating a caption watermark from the generated digital watermark according to a preset time line;
and the caption watermark display unit is used for loading the WebVTT caption through Track and displaying the caption watermark on the video interface through a preset position and a preset line.
Wherein the time and location are randomly displayed on the video interface.
Further, WeChat android version adds watermark module still includes:
the third watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
and the pseudo-full screen generating unit is used for acquiring the width and height of the window of the mobile terminal corresponding to the current client, and correspondingly setting the width and height of the video player according to the acquired width and height of the window of the mobile terminal.
By adopting the system, the application program is not downloaded, and the superposition of the video watermark can be realized by watching the video in the WeChat public number, so that the video watching, the video superposition leakage prevention and the tracing of the watermark are more convenient.
The time of the generated watermark on the video is random, so that a way that a student traces back to a time period when the video is recorded to avoid the watermark and a way of avoiding the position of the watermark can be ensured, and the security of the anti-disclosure of the WeChat public number video is ensured.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A method for WeChat public number video anti-disclosure and tracing, which is characterized in that the method comprises the following steps:
s1: identifying the client type based on the current WeChat public number through a user agent, wherein the client type comprises a WeChat Windows version, a WeChat IOS version and a WeChat Mac OS version;
s2: if the client type based on the current WeChat public number is the WeChat Windows version, performing watermark superposition on the video in the WeChat public number according to the WeChat Windows version watermark superposition process;
s3: if the client type based on the current WeChat public number is not the WeChat Windows version, judging whether the client type based on the current WeChat public number is the WeChat IOS version or the WeChat Mac OS version;
s4: if the client type based on the current WeChat public number is a WeChat IOS version or a WeChat Mac OS version, performing watermark superposition on a video in the WeChat public number according to a first mobile terminal watermark superposition process;
s5: and if the client type based on which the current WeChat public number is not the WeChat IOS version or not the WeChat Mac OS version, performing watermark superposition on the video in the WeChat public number according to a second mobile terminal watermark superposition process.
2. The method for video anti-disclosure and tracing of WeChat public Signal according to claim 1, wherein step S1 is preceded by the steps of:
verifying whether the WeChat public number obtains authorization;
if the WeChat public number is authorized, verifying whether the WeChat public number is bound with the mobile phone number; if the WeChat public number is not authorized, continuing to verify;
if the WeChat public number is bound with the mobile phone number, executing the step S1; and if the WeChat public number is not bound with the mobile phone number, requesting the client to bind the mobile phone number.
3. The method for the divulgence-proof and tracing of the WeChat public number video according to claim 1, wherein the WeChat Windows version watermark superposition process in the step S2 includes the steps of:
s21: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s22: floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
s23: and adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index.
4. The method for the anti-disclosure and tracing of WeChat public number video according to claim 1, wherein the first mobile terminal watermark superposition process in step S4 includes the steps of:
s41: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s42: generating a subtitle watermark by the generated digital watermark according to a preset time line;
s43: and loading the WebVTT caption through Track, and displaying the caption watermark on a video interface through a preset position and a preset line.
5. The method for video anti-disclosure and tracing of WeChat public Signal according to claim 4, wherein the step S43 further comprises the steps of:
s431: loading a WebVTT subtitle through Track, and displaying a subtitle watermark on a video interface through a preset position and a preset line;
s432: monitoring whether the subtitle watermark is closed or not according to preset monitoring time through a preset script;
s433: if closed, the switch is forced to be opened.
6. The method for the anti-disclosure and tracing of WeChat public number video according to claim 1, wherein the second mobile terminal watermark superposition process in step S5 includes the steps of:
s51: intercepting a preset digit of a mobile phone number bound by the WeChat public number according to preset interval time, and generating a digital watermark by the intercepted digit of the preset digit;
s52: acquiring the width and height of a window of a mobile terminal corresponding to a current client;
s53: correspondingly setting the width and the height of a video player according to the obtained width and the height of the window of the mobile terminal;
s54: floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
s55: and adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index.
7. A system for wechat public number video anti-disclosure and traceability tracking, comprising:
the client type identification module is used for identifying the client type based on the current WeChat public number through a user agent, wherein the client type comprises a WeChat Windows version, a WeChat IOS version and a WeChat Mac OS version;
the WeChat Windows edition watermarking module is used for performing watermarking superposition on the video in the WeChat public number according to a WeChat Windows edition watermarking superposition flow when the type of the client based on the WeChat public number is the WeChat Windows edition;
the WeChat apple edition watermarking module is used for performing watermarking superposition on videos in the WeChat public number according to a first mobile terminal watermarking superposition process when the type of a client based on the WeChat public number is a WeChat IOS edition or a WeChat Mac OS edition;
and the WeChat android version watermarking module is used for performing watermarking superposition on the video in the WeChat public number according to a second mobile terminal watermarking superposition process when the type of the client based on the WeChat public number is not the WeChat IOS version or not the WeChat Mac OS version.
8. The system for preventing disclosure and tracing of WeChat public number video according to claim 7, wherein the WeChat Windows version watermarking module comprises:
the first watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
the watermark superposition video unit is used for floating the generated digital watermark on a video played in the WeChat public number through css3+ div;
and the display position adjusting unit is used for adjusting the display positions of the video and the digital watermark played in the WeChat public number through the z-index.
9. The system for preventing disclosure and tracing of WeChat public signal video according to claim 7, wherein the WeChat apple watermarking module comprises:
the second watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
a caption watermark generating unit for generating a caption watermark from the generated digital watermark according to a preset time line;
and the caption watermark display unit is used for loading the WebVTT caption through Track and displaying the caption watermark on the video interface through a preset position and a preset line.
10. The system for the video anti-disclosure and tracing of the WeChat public number according to claim 7, wherein the WeChat android watermarking module further comprises:
the third watermark generating unit is used for intercepting the preset digits of the mobile phone number bound by the WeChat public number according to the preset interval time and generating the digital watermark from the intercepted digits of the preset digits;
and the pseudo-full screen generating unit is used for acquiring the width and height of the window of the mobile terminal corresponding to the current client, and correspondingly setting the width and height of the video player according to the acquired width and height of the window of the mobile terminal.
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| CN1997185A (en) * | 2005-12-31 | 2007-07-11 | 北京华旗数码影像技术研究院有限责任公司 | Mobile communication terminal for receiving the watermark information and its system and watermark embedding method |
| US20170127151A1 (en) * | 2015-10-29 | 2017-05-04 | Le Holdings (Beijing) Co., Ltd. | Method and Device for Protecting Video Digital Copyrights |
| CN105872704A (en) * | 2015-12-15 | 2016-08-17 | 乐视网信息技术（北京）股份有限公司 | Video playing control method and device |
| CN107959895A (en) * | 2017-11-28 | 2018-04-24 | 三峡大学 | A kind of video playing retroactive method and device |
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