Systems and methods are directed towards generating a verified unique watermark. More specifically, the systems and methods are directed towards generating a watermark that is as long as possible without any repetition. Such watermarks are possible by selecting characteristics of the watermark and methods for producing the watermarks (e.g., dandy rollers). By producing longer unique watermarks, users would be capable of generating longer rolls of paper whereby more sheets can be produced that each possesses a unique watermark. With the unique watermark, users can identify what information is printed on each sheet as well as authenticate the contents of each individual sheet.

The present disclosure relates to a method and electronic device for controlling video play. Wherein, the method for controlling video play may include: acquiring identity information of a current playing device when a video is played; generating a watermark logo comprising the identity information; and displaying the watermark logo on a playing interface of the video.

A data-bearing medium has an array of data-bearing elements. The array of data-bearing elements represents an array of bits. A certain number of the bits repeat within the array of bits. Positions of the bits in each row of the array of bits are circularly shifted from positions of the bits in an immediately preceding row.

A printing system receives a graphic document having a security area. The graphic document identifies a secure color to print in the security area. The graphic document is converted for printing by a printing engine of the printing system. This converting substitutes a secure patterned color in place of the secure color. The specific printing engine prints the printing bitmap to output a printed version of the graphic document with the secure patterned color in the security area. The security area of the printed version of the graphic document has a color appearance, and the secure color does not identify the type of security feature within the secure patterned color.

A printing system receives a graphic document having a security area. The graphic document identifies a secure color to print in the security area. The graphic document is converted for printing by a printing engine of the printing system. This converting substitutes a secure patterned color in place of the secure color. The specific printing engine prints the printing bitmap to output a printed version of the graphic document with the secure patterned color in the security area. The security area of the printed version of the graphic document has a color appearance, and the secure color does not identify the type of security feature within the secure patterned color.