 Some technologies have been developed to do this, but they generally involve either human cataloging or automated indexing on the OCR document.However, scanners and software continue to improve with the development of small, portable scanners that are able to scan doubled-sided A4 documents at around 30-35ppm to a raster format (typically TIFF fax 4 or PDF).An issue faced by those wishing to take the paperless philosophy to the limit has been copyright laws.