Patent ID: 9420143
Filing Date: 2016-08-16
CPC Classification: G06F,G06T,H04N

Claim Text:
1. A method for water-marking a digital book with parameters linked by a bijective function to respective identifiers, the digital book containing a pre-existing coded text in which each character is coded by at least one code and a pre-existing typeface or a reference to a pre-existing typeface, each typeface having code/glyph pairs, each code/glyph pair associating a code from the pre-existing coded text with a glyph used for displaying a character, wherein the method comprises the steps: of developing, for each parameter, a new typeface on a basis of the pre-existing typeface, by creating at least one new code/glyph pair that is different from the existing code/glyph pairs in the pre-existing typeface, this new code/glyph pair being distinguished from the existing code/glyph pairs by at least one of the following differences: of developing a new coded text on the basis of the pre-existing coded text by replacing, in the pre-existing coded text, at least one code or group of codes from the pre-existing typeface allowing display of a character or a combination of characters from the digital book by the code or group of codes from the new typeface allowing display of a graphically perfectly identical character or combination of characters on any screen, this code or this group of codes from the new typeface having at least the code from the new code/glyph pair such that the new coded text developed in this manner is different for each different value of the identifier, of providing the new coded text and the new typeface or a reference to the new typeface as a water-marked digital book.