[PaulHoule]

They are too lazy to retype.

There are so many ways you could catch leakers of sensitive information this way. Look at how often government agencies react information in PDFs by writing black blocks over the text.

Note it could be used for authentication in the opposite direction, only accepting text with the unusual spaces in it.

So far as catching the indolent and the ignorant, making an example here or their works wonders.