Open source usually means that you are able to modify and redistribute the software in question freely. However between open and closed, there is another class - source-available software. From its wikipedia page:
> Any software is source-available in the broad sense as long its source code is distributed along with it, even if the user has no legal rights to use, share, modify or even compile it.
> Any software is source-available in the broad sense as long its source code is distributed along with it, even if the user has no legal rights to use, share, modify or even compile it.