(eg 17) In practice, this method did the work for me because they couldn't figure out what I was embedding in the documents. Each empty line would contain a certain number of spaces that's obviously not random or accidental. Selecting the text carefully would show the whitespace.
The file looked the same to them: some programming statements and line breaks. The trick I came up with was to put in a specific pattern of whitespace between programming statements (or paragraphs). I needed an invisible watermark that worked in text files. This is my original contribution to watermarking. I used several tricks to beat even the best thieves: whitespace watermarking metadata watermarking unusual characters trusted timestamping modus operandi.
We had Windows 2000 machines and uploaded files to a Novel network folder that everyone could see. I had the same problem as you a long time ago.
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