Yes, my products are protected from illegal distribution. It’s a necessary measure.

• Otherwise these chess courses will be quickly distributed amongst all the chess players. This will reduce the courses’ power (because your opponents will share this knowledge with you).
• Also it will be annoying for you, if you pay for a product while many other people got it for free.

I want to protect my honest customers and my products. That’s why I implemented an anti-piracy protection.  Therefore an honest customer will not feel any inconvenience.