I think, provided it is not technically possible for you to simultaneously use the software that you could sell it for a short period and then buy it back but you're not normally given a license to lend a work (it's usually specifically disclaimed) so the original acquirer wouldn't be able to pass on such a right (as they don't have it).
>It follows from the foregoing that the answer to Questions 1 and 3 is that Articles 4(2) and 5(1) of Directive 2009/24 must be interpreted as meaning that, in the event of the resale of a user licence entailing the resale of a copy of a computer program downloaded from the copyright holder’s website, that licence having originally been granted by that rightholder to the first acquirer for an unlimited period in return for payment of a fee intended to enable the rightholder to obtain a remuneration corresponding to the economic value of that copy of his work, the second acquirer of the licence, as well as any subsequent acquirer of it, will be able to rely on the exhaustion of the distribution right under Article 4(2) of that directive, and hence be regarded as lawful acquirers of a copy of a computer program within the meaning of Article 5(1) of that directive and benefit from the right of reproduction provided for in that provision. //
This could lead to rulings on what a "sale" is.
http://curia.europa.eu/juris/document/document.jsf?text=&... gives a summary thus:
>It follows from the foregoing that the answer to Questions 1 and 3 is that Articles 4(2) and 5(1) of Directive 2009/24 must be interpreted as meaning that, in the event of the resale of a user licence entailing the resale of a copy of a computer program downloaded from the copyright holder’s website, that licence having originally been granted by that rightholder to the first acquirer for an unlimited period in return for payment of a fee intended to enable the rightholder to obtain a remuneration corresponding to the economic value of that copy of his work, the second acquirer of the licence, as well as any subsequent acquirer of it, will be able to rely on the exhaustion of the distribution right under Article 4(2) of that directive, and hence be regarded as lawful acquirers of a copy of a computer program within the meaning of Article 5(1) of that directive and benefit from the right of reproduction provided for in that provision. //