Last week I saw in a new project wish-list a line which is a common mistake in the understood of Open Source concept:
"All the programs are Open Source and license not required"
Many Open Source programs are free (free as freedom) and not require to buy a license (free as beer), but you already have a license to use it, maybe the author don't need you to license, because you are accepted the license when you download/install/use the code.
Do you always read the license terms? I don't, because I try to use Open Source only.
Software is like sex; it's better when it's free.
Attributed to Torvalds at 1996 FSF conference.