There's no such thing as "the" open-source license. There are lots of them. Sixty-nine to be precise if one accepts the Open Source Initiative (OSI) as the definitive arbiter of what is open source and what is not.
Some are essentially legacy licenses; in general, the continued proliferation of licenses has abated in recent years but it's often more trouble than it's worth to fully retire licenses that are still in use by active software. Others won't be relevant to a specific type of copyrighted material, such as software programs. (Material under an open-source … Read more