[DNSB]

I don't feel that loaning ebooks should be done. Unless you are deleting the file from your storage system after sending a copy to your 'good buddy', it is not equivalent to loaning a paper book where you can't access the book after loaning it to that 'good buddy' until/if they return that copy.

OTOH, I no longer loan paper books. I had too many 'loans' over the years that either did not get returned (one person read one of my books and then donated it to a local charity—evidently, they thought I had given the book to them) or they came back in a condition that suggested the back of a pickup truck had been used for storage.

On yet another hand, I do share my calibre library with my wife though our tastes in reading are rather different. I think there are two authors whom we both read. That may or may not be completely legitimate given that any property acquired after our marriage is considered to belong equally to both of us as family property. The only case I am aware of in this jurisdiction that was related to licenses, the court ruled that both spouses had an equal interest in software licenses acquired during their marriage.