I'm a gamer at heart and found this on my game website of choice, thought you all might find it interesting as it also deals with CAD software. (and I know some of you are gamers also)
ps. - To answer the OP, Plotter Art is great as I've sold plenty of it in the past and Aurora is also pretty good but a tad on the high end side $ wise.
Games are licensed, not sold says Courts of Appeal
Following a protracted case involving the sale of second-hand software on eBay, the US Courts of Appeals for the Ninth Circuit has upheld the right of software companies to deny their customers the right to resell their products.
Although the court case revolved around AutoCAD, software for computer aided design, the knock-on effect could have huge implications for the used game market, as the judge reiterated that – "A software user is a licensee rather than an owner."
As video games are also subject to license agreements, the court ruling could potentially prevent users reselling their used games in the future, as well as putting rental companies under draconian restrictions.