Encoding of modified video

A non-transitory computer-readable storage medium having stored thereon instructions for implementing a method, when executed on a device having processing capabilities, the method for processing a video stream comprising:

• receiving a first set of input image frames comprising image data originating from a first source of input image frames;
• receiving a second set of input image frames comprising image data originating from a second source of input image frames, wherein the second set of input image frames includes modifications or changes relative to the first set of image frames;
• encoding the first set of input image frames and the second set of input image frames into, respectively, a first set of encoded image frames and a second set of encoded image frames, forming a combined video stream, wherein an encoded image frame of the first set of encoded image frames exclusively references one or more other encoded image frames of the first set of encoded image frames, and wherein an encoded image frame of the second set of encoded image frames references both an encoded image frame of the first set of encoded image frames and another encoded image frame of the second set of encoded image frames;
• designating the first set of encoded image frames as image frames not to be displayed or designating the second set of encoded image frames as image frames to be displayed;
• signing, using a first key, a first signing group comprising one or more encoded image frames of the first set of encoded image frames, wherein the first key pertains to the first source of input image frames;
• and
• signing, using a second key, a second signing group comprising one or more encoded image frames of the second set of encoded image frames, wherein the second key pertains to the second source of input image frames.

A video processing system comprising a processor configured to:

• receive a first set of input image frames, comprising image data originating from a first source of input image frames;
• receive a second set of input image frames, comprising image data originating from a second source of input image frames, wherein the second set of input image frames includes modifications or changes relative to the first set of image frames;
• encode the first set of input image frames and the second set of input image frames into, respectively, a first set of encoded image frames and a second set of encoded image frames, forming a combined video stream, wherein an encoded image frame of the first set of encoded image frames exclusively references one or more image frames of the first set of encoded image frames, and wherein an encoded image frame of the second set of encoded image frames references both an encoded image frame of the first set of encoded image frames and another encoded image frame of the second set of encoded image frames;
• designate the first set of encoded image frames as image frames not to be displayed or designate the second set of encoded image frames as image frames to be displayed;
• sign, using a first key, a first signing group comprising one or more encoded image frames of the first set of encoded image frames, wherein the first key pertains to the first source of input image frames;
• sign, using a second key, a second signing group comprising one or more encoded image frames of the second set of encoded image frames, wherein the second key pertains to the second source of input image frames.