I have a PDF document, and I want to mask certain text blocks. The reason why I want to do this, is because I don’t want this text to be indexed, nor I want this information to be easily accessible by selecting and copying this text block.
What should be the right way to do this?
I guess turning the text to raster would be bad idea, and I don’t know if there is some tool that can make only cartain text parts with special privileges.
You will need a program that can convert a font into a series of shapes.
Illustrator may have the functionality you want: see here and here.