Hi Miguel, I guess for SL distribution, it should be based on GPLv2, but if you are asking license for each package, I believe some of packages would not be GPL, such as "bind" which would be BSD license I guess. Whatever, most of packages should be GPL with any version, you can check them by rpm -qi <package name>. Or you can check either your SL iso(if you have downloaded it) or online repositories: http://ftp.scientificlinux.org/linux/scientific/6x/x86_64/os/ http://ftp.scientificlinux.org/linux/scientific/5x/x86_64/ And search any directory about "repoview", you will see a lot .html for specific package in there, for example: http://ftp.scientificlinux.org/linux/scientific/5x/x86_64/SL/repoview/authconfig-gtk.html http://ftp.scientificlinux.org/linux/scientific/5x/x86_64/SL/repoview/tunctl.html http://ftp.scientificlinux.org/linux/scientific/5x/x86_64/SL/repoview/automake16.html Just open the html, it will show you what GPL version it is then. Not sure if that answer your question? Felix Lee ~ -- Felix Lee Academia Sinica Grid & Cloud. Tel: +886-2-27898308 Office: Room P111, Institute of Physics, 128 Academia Road, Section 2, Nankang, Taipei 115, Taiwan