These scores are technically rental scores. Information about why only rental scores are available can be read here. This means that the physical copy of the music is technically on loan to you (albeit in perpetuity for your lifetime), and remains the property of the publisher. All rights, including but not limited to reproduction (in whole or in part), performance, lending, trading and resale, remain with the publisher. No reproduction for any reason is allowed, including so-called fair use/practise/dealing exemptions. In particular, libraries are not permitted to add these works to their holdings. Please contact the publishers directly to negotiate permission to use or dispose of the score in any way beyond private enjoyment.
Failure to abide by these conditions will result in legal action, with a fine of not less than $500.00 per volume of the songbooks, payable to the publishers. (You are agreeing to this contractually by paying for the rental of the book.) The scores are individually recognisable, so take heed!
If the terms are breached in such a way that multiple copies are disseminated (including electronically), the fines will be not less than $50,000.00 per volume of the songbooks unlawfully distributed, regardless of the number of copies actually made or downloaded, and regardless of any theory or estimate of the actual damages in terms of lost revenue.
It is advisable that you take good care of your copies, since theft or accidental loss will not be accepted as an excuse to exempt you from these terms. If the terms are not acceptable to you, do not rent the books!
The terms purchase, cost and price, when used on this site, always refer to the rental fee—there is no option to buy the books outright at this time. At some future time, not yet specified and depending on whether reasonable financial returns have been realised on this project, the rental copies will revert to simple ownership, at which point you can sell them or whatever. Of course, reproduction would still be prohibited, and performance rights are, as usual, reserved for the duration of the copyright.