A method for forming a coating of nano-sized material on the surface of another material using a micromachining bead-blasting machine for implantation of nanoparticles is disclosed. When the above donor element is brought into contact with a receptor and imagewise irradiated, an image is obtained which is free from contamination by the light-to-heat conversion layer. One or more packets are dropped intentionally from the stream to render unusable at the destination a file or other data transported through the multimedia tunnel without authorization. The respective output ports of the inputoutput optical system each have a lens coupled to an end face of an optical fiber, and the lens has a structure where a focal length of a first region corresponding to inside a variable range of attenuation is different from a focal length of a second region corresponding to outside the variable range. The polymer alloy of this invention can provide a molded article, film, fibers and the like respectively with excellent mechanical properties at high productivity. Similarly, an acquisitionplayback device itself can review the digital information stored in the re-writable memory and determine whether to commit that file to the write-once memory or to discard the file from the re-writable memory.