| 摘要 |
The invention relates to a method which includes the steps of: presenting text information on a screen of at least one computer device of a user which provides a bitmap text image; limiting the time during which said bitmap text image is presented on said screen; generating at least two background bitmaps of said bitmap text image using a colour for the pixels of the background of said background bitmaps that is different from the colour for the pixels of the text; and displaying said bitmap text image at the top of one of said at least two backgrounds, wherein a percentage of the background pixels of any of said at least two background bitmaps, which are selected at random,changes to said colour of the text pixels, such as to make it impossible to obtain a combined image that is variable over time by means of a screen capture. The system is configured such as to implement the method. |
