One possible synonym for "obliged" is "expected".
Quote:
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"Anyone offering a book for sale is obliged^h^h^h^h^h^h^hexpected to do the work required to present a quality product"
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"Obliged" may not be the most common word found in this scenario, but the word fits, and this is proper usage of it.
It's like when I order a book from Amazon, USA, to be delivered to an address in the USA, they are obliged to send me one in English, unless the description states that it's in some other language. This may not be a legal requirement, but it is certainly expected, and rightfully so.