1. When you choose the 'Printed Sheet Music' option, you will receive the printed parts and score by postal services.
2. When you choose the 'PDF Download Files' option you will be able to download the PDF files of the score and parts
When you purchase PDF Download Files you are paying for the same product as the physically printed sheet music. You are paying for a LICENCE to print these PDF files.
Purchasing a licence gives you, or the company/band/educational institution you represent the right to print the given sheet music for own use.
Further sales (pirating) or any other way of distributing the PDF Download Files is a breach of this licence and can be fined by law.