Our white paper on Potentially Unwanted Applications (PUAs) has been revised with additional information, including information about how legitimate software can become classified as a PUA due to its misuse, a discussion of a type of downloader called a software wrapper and updated screen shots. It can be found in the White Papers section  Problematic,

Aryeh Goretsky interviewed, as his paper on Possibly Unwanted Applications is published.

“Written in the form of a personal retrospective, this paper compares the earliest days of PC computer viruses with today’s threats, as well as provides a glimpse into the origins of the computer anti-virus industry.”

[Update: Michael St Nietzel also pointed out that there's an issue with installers that verify a checksum before installation. In fact, this is a special case of an issue I may not have made completely clear before: unless this approach is combined with some form of whitelisting, there has to be some way of reversing the modification