“ Article 9 The offering and sale and the principal and interest payments of the certificates of each issue of the Bond shall be managed by the Central Bank. Article 10 The certificates of any issue of the Bond may be freely traded, pledged, or used as guarantees in official dealings, and may serve as guarantee reserve of financial enterprises. Article 11 Interest on the certificates of each issue of the Bond is exempt from income tax. ”

“ It also excludes from copyright oral and literary news reports strictly intended to communicate facts, test questions from all kinds examinations held pursuant to laws or regulations, slogans and common symbols, terms, formulas, numerical charts, forms, notebooks, or almanacs. ”