Abstract: The gathering of content (such as a file) from a variety of different sources. Rather than provide the whole content, a given one of the sources instead provides only a portion of the information represented by the content. The source also provides a share of, but not the entirety of, the shared secret that will be used to decode. For instance, in one embodiment, the source might encode only a portion of the content using the shared key, and then transmit the encoded portion. As an alternative, the source might encode the entire content, and then transmit a portion of that encoded content.

Abstract: An improved method and block transform for image or video encoding and decoding, wherein transformation and inverse transformation matrixes are defined such that computational complexity is significantly reduced when encoding and decoding. For example, in the two-dimensional inverse transformation of de-quantized transform coefficients into output pixel information during decoding, only four additions plus one shift operation are needed, per co-efficient transformation, all in sixteen-bit arithmetic. Transformations provide correct results because quantization during encoding and de-quantization (sixteen bit) during decoding, via the use of one of three tables selected based on each coefficient's position, have parameter values that already compensate for factors of other transformation multiplications, except for those of a power of two, (e.g., two or one-half), which are performed by a shift operation during the transformation and inverse transformation processes.