On 8 August 2013 16:17, Rilke Rainer Michael <ri...@wiso.uni-koeln.de> wrote: > Hi List, > > > > I want to export a lyx document to a pdf. However, I want also that once > reading the document it is impossible to copy and paste text from this pdf. > Do you have any idea, whether there is a workaround for lyx?
That is encryption. You have the choice of disabling printing as well. Converting to images, or rasterizing fonts, has the same effect as not allowing copies but greatly increases the file size. However, this is a standalone process, separate from LyX. I use PDFtk on GNU/Linux.   http://www.pdflabs.com/docs/pdftk-cli-examples/ -- GPG/PGP ID: C0711BF1