Ebooks for sale
Entity Systems s.r.o. may offer for sale ebooks and other downloadable materials for on its website. These materials in these publications are used at your own risk and Entity Systems is not liable for any losses you may incur by using these concepts.
If you are unsatisfied with the information in documents or with any other issue, you may request a full refund after deleting the material from your electronic equipment, and destroying any physical copies that you have made, and Entity Systems will provide a full refund.