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"I then make a backup copy on my own computer..."
That may be the deal breaker, depending on the terms and conditions of the sale. The copyright holder has the exclusive right to make copies of any kind. When you buy a copy, you have the right to own and use one copy. If you physically give that single copy to someone else, you're on reasonable ground. (Yes, some lawyers will kvetch, but I doubt anyone would be dumb enough to sue you, and clearly establish a precedent.) If you make additional copies, now "fair use" comes into play, and that's a mess for digital copies. Archival copies are sometimes legal, and sometimes not.
Regards,
Jack Tingle
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