I don't know if there is a technical workaround, maybe it would be best to ask the technical stuff of your college if they could provide you the ebooks in another way, maybe protected via Adobe DRM.
But I have my doubts if you would become very happy reading the textbooks on your Sony 505. It may be that these pdf files are produced for a far bigger page size than A6/6"/15 cm. If this is the case the books won't be readable on your Sony Reader because his size is too small.
But of course you're right, this is more than dumb.
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