You can print any score once you have viewed the score. Click on the 'print' icon in the image viewer, where you can select whether to print all pages, a movement, or a page range.
Scores printed from Classical Scores Library are to be used for individual use only (study, notation, etc). You are not allowed to perform from the printed version of the PDF.
Yes, you are allowed to project any of the scores for classroom instruction.
If you have a subscription to Classical Music Library, you will see a 'play recordings' icon appear next to the 'add to playlist' icon in the score title on the full score page. This link will open up a new window and take you to all of the associated recordings we have of the work. If there is no associated recording, the 'play recordings' icon will not appear.