Abstract: The present disclosure allows for the downloading of large digital media files in a progressive manner by allowing for a transfer of such digital media to occur over various sessions. A file server is described that receives a request to transmit a file whereupon the file server locates such requested file in its memory. For verification purposes a unique identifier is computed for the requested file such as an MD5 checksum of the digital file. Thereafter an encryption key, K1, is chosen. Using a second key, K2, the first key and the unique identifier are encrypted, and the requested file is encrypted using the first key. Both these encrypted values are then transmitted. Subsequently, for example, after payment is received, an unencrypted form of the first key is also transmitted. The first key can then be used to decrypt the requested file to unlock full functionality of the requested file.

Abstract: An abrasive blade for cutting material, the blade comprising a plurality of raised portions, a plurality of recessed portions, and a plurality of transition portions. Each transition portion connects a raised portion with a recessed portion. Each of the plurality of raised portions is substantially flat; and each of the plurality of recessed portions is substantially flat and spaced laterally from the plurality of raised portions. The plurality of raised portions, the plurality of recessed portions, and the plurality of transition portions form corrugations in the abrasive blade.

Abstract: A lower arm encircling brace and support portion and an upper arm encircling brace and support portion are hingedly connected together so that when fit about and to the arm of a person, to each side of their elbow, the device does not interfere with bending of the arm. Each support portion is formed of relatively flexible but sturdy material and extends almost around and for the length of their respective arm portions. Velcro straps are utilized to fit the portions snugly and securely to the person's arm. A fishing rod support fixture is carried by the device to receive and facilitate disposition and use of relatively long "spinning type" fishing rods particularly by children and persons of slight build. The fishing rod support fixture can either be disposed at the hinge connection with its disposition further supported by a stabilizing strap, or at a disposition centered end-to-end on the lower arm encircling brace and support portion.