The four different licence elements are:
Attribution: You must always provide credit to the original author - BY
Share-Alike: If you remix, transform, or build upon the material, you must distribute your contributions under the same licence as the original - SA
Non-Commercial: You may not use the material for commercial purposes - NC
No-Derivatives: You may not distribute modified versions of the work - ND
For Open Educational Resources (OERs), try to use Creative Commons material with:
Both these licences permit commercial use. If you are creating an open course or MOOC, that later is commercialised, you can still use the resources if they have a BY or BY SA licence.
You must acknowledge the creator and include any copyright information when you use a resource.
The basic requirements are: