It is a part of the new LW for legal reasons. If you decide that it doesn't matter downlding copyright material, then tick Yes, & you can optionally then tick Always use this answer (& you won't be asked again.) If you don't want to take the risk then press no. But if you press no & choose always use that answer, you'll not be asked & not be able to downld files that would have requested information about licensing; thus you'll need to do one of 2 options:

(1) Revert Popups to Default : Go to LW's menu bar, Tools>Options>View>Popups & click revert to default.

(2) Go to LW's menu bar, Tools>Options>Searching>Basic & decide whether to tick or untick "Show License Warning" (this is a setting you should do when 1st setting up.)