This book is sold subject to the condition that it shall not, by way of trade or otherwise, be lent, re-sold, hired out or otherwise circulated without the publisher’s prior consent in any form of binding or cover other than that in which it is published and without a similar condition including this condition being imposed on the subsequent purchaser.
I don't quite understand the grammar behind the is sold subject to part. Is subject to the condition that... used as some kind of adverbial construct? If so, then I believe I can ask the following question:
How is this book sold?
And receive the following answer:
It is sold subject to the condition that you are not allowed to make copies of it and redistribute it.
Is my understanding correct?