Always  good  to review what  the terms of  each is.  Newcomers    may not
understand completely.
Same  with photo usage and video and music  usage  -   there are   various
terms of  usage  for these  media  types.
Ed#  _www.smecc.org_ (
http://www.smecc.org)
In a message dated 2/15/2017 9:13:36 A.M. US Mountain Standard Time,
hachti at hachti.de writes:
One  should also be aware of the difference between public domain, open
source,  free software and the different license models and have an
understanding  of the applicable rights and obligations.
Kind  regards
Philipp