The Internet has become one of the main sources of knowledge acquisition, harboring resources such as online newspapers, web portals for scientific documents, personal blogs, encyclopedias, and advertisements. It has become a part of our daily life to search and access this immense amount of online information, and more recently we have also started to contribute to this pool of information our own creativity in the form of text, images and video. Unfortunately, it is still an open question as to how we, as authors, can control the way that the information we create is distributed or re-used. Rights management problems are serious for text since it is much easy for other people to download and manipulate copyrighted text from Internet and later re-use it free from control. There is a need for a rights protection system that ``travels with the content''. Digital watermarking is an information hiding mechanism that embeds the copyright information in the document. Besides traveling with the content of the documents, digital watermarks are also imperceptible (i.e., seamless) to the user, which makes the process of removing them from the document challenging. Using linguistic features for information hiding into natural language text is an exciting and new idea. This talk begins with a short survey of existing technologies in natural language watermarking, and then focuses on a recently developed natural language watermarking system that is practical, easy-to-use and provides resilience to attacks through the use of ambiguity in natural language. The talk is aimed for a general audience, and will be self-contained covering the necessary background information.