This item is (on) an external site. The license as stated on that site holds.

This item is (on) an external site. The license as stated on that site holds.
Check that site to find out what you are allowed to do with the item. This might be stated for instance in a section 'terms of use' or 'copyright'.
If no specific information is given, assume that the material is under copyright. Then you are not allowed to use the material, unless you have obtained permission of its owner.