One Reader can be used on multiple PCs as long as all of them are on the same account. One Reader cannot be authorized on multiple accounts. Its Sony's way of keeping you from sharing DRM content with others that are not part of your account.
There was a thread a while back about a son and Mother that each had a Reader and shared the same account -- the son in North America and the Mother in the UK. Thankfully, as I remember, they had the same taste in books.
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