A few days ago I talked with someone about writing a book about TeX and we came to the question if TeX as a word and its Logo (and the related things like LaTeX, XeTeX, …, package names etc.) are (registered) trademarks or can I use it freely as any other word like dog, house, moon, …?
- using in book titles: Start with TeX or Become a TeXnician …
- using in corparate names: LaTeX production company or TeX Help Line …
Are there any restrictions in using “TeX” commercially (assuming the products/services are TeX related)?
How about the derived words like “LaTeX”, “XeTeX” etc.
Edit: As Patrick said, the country could be important … I’m living in Germany and want to sell from there too but I could imagine that there are readers from Swiss and Austria for German books too.