Then use an image, not a text. (Or use a font-mapped text which is not externally exposed by itself. Seemingly similar to PDF, but alas, PDF supports textual se

Then use an image, not a text. (Or use a font-mapped text which is not externally exposed by itself. Seemingly similar to PDF, but alas, PDF supports textual selection ;-) If you cannot afford that you'd better acknowledge the complexity of multilingual systems.