- TeXLive is free software see the files:

  /usr/share/licenses/texlive2018-bin/LICENSE.TL
  /usr/share/licenses/texlive2018-bin/LICENSE.CTAN

=====================================================================

  To update you TeXLive installation use only the program 

  /opt/texlive/2018/<arch>/tlmgr

  where <arch> is:
    - x86_64-linux  ==> x86_64 architecture
    - i386-linux    ==> i386 architecture

  see:

  http://www.tug.org/texlive/doc/tlmgr.html#EXAMPLES
  
  for the details and the documentation in 
    		 		 
  WARNING: To avoid messing up your TeXLive installation, DON'T use
  the installation scripts in /opt/texlive-installer.
