Adaptation of Mandarin Chinese Materials

Hello,
I'm a big fan of this site, and I'm extremely grateful for being able to make use of these materials
I would like adapt the Mandarin materials as a book, which I would sell with a modest profit margin. If the project does turn a profit, I will happily contribute funds back to this project (for obtaining new materials or to help with web hosting costs.)
I have two questions:
Is the Chinese course completely in the Public Domain? The notice at the beginning of the books says:
"The DLIFLC may not have full rights to the material it produces. Purchase by the customer does not constitute authorization for reproduction, resale, or showing for profit. Generally, products distributed by the DLIFLC may be used in any not-for-profit setting without prior approval from the DLIFLC"
Are there any sections of the course that are borrowed from another copyrighted source?
Second question: The old site listed the contributors of each course, unfortunately, the new one does not. Who scanned the course? Does someone have a high-resolution copy of the materials? The ones for download are at 100dpi only.
Thank your for your responses.
I'm a big fan of this site, and I'm extremely grateful for being able to make use of these materials
I would like adapt the Mandarin materials as a book, which I would sell with a modest profit margin. If the project does turn a profit, I will happily contribute funds back to this project (for obtaining new materials or to help with web hosting costs.)
I have two questions:
Is the Chinese course completely in the Public Domain? The notice at the beginning of the books says:
"The DLIFLC may not have full rights to the material it produces. Purchase by the customer does not constitute authorization for reproduction, resale, or showing for profit. Generally, products distributed by the DLIFLC may be used in any not-for-profit setting without prior approval from the DLIFLC"
Are there any sections of the course that are borrowed from another copyrighted source?
Second question: The old site listed the contributors of each course, unfortunately, the new one does not. Who scanned the course? Does someone have a high-resolution copy of the materials? The ones for download are at 100dpi only.
Thank your for your responses.