Again there is copyrighted material in the library:
For all new LingQ members: Don’t upload copyrighted material. All materials from scientificamerican are copyrighted!
For that reason they are listed in the import section for private use only.
If you find material under a common creative licence make sure that
- it isn’t published in the LingQ library from another user and
- it isn’t a non-commercial licence.
Always the best way is to ask the content owner for permission.