Copy-protected documents and printing method for obtaining copy-protected documents

摘要

The invention relates to documents, in particular so called security documents including banknotes and the like, which are protected against copying, and to a method for printing such documents. According to the invention at least part of the information on the documents consists of lines and/or parts of lines and/or dots having a width of less than 20 micron and preferably the distance between those lines and/or parts of lines and/or dots is not less than 200 micron.