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Why Freeware Is A Solution, Not A Problem: Page 5 of 9

So, any user, including businesses and governments, may use SpywareBlaster for free; it's a totally legitimate, licensed use. But those who wish the convenience of auto-updating, and/or who wish to support the ongoing development of the software may purchase the auto-update version for $10 per seat per year. (Note: A networked version of SpywareBlaster is also in the works. The site says: "We anticipate its release within the next 2 months. The network version will assist administrators of large networks in protecting large numbers of machines, and in keeping that protection up-to-date.")

See
this page for complete license information.

Split Free/Commercial Licensing Tools
The highly-regarded Ad-Aware anti-spyware tool is a good example of split licensing: The publishers offer the software in several versions, each with a separate license: The basic product, "Ad-Aware Personal," is free and available for noncommercial use by private individuals; "Ad-Aware Plus" offers more flexibility and functions, and costs $26.95; "Ad-Aware SE Professional" offers still more flexibility and features, and is aimed at IT professionals and corporate/governmental installations. One copy costs $39.95, but the per-seat costs drop to as low as around 70-cents a seat with very large volume purchases. You can see all the pricing options and read the full license terms for each version via the link to Lavasoft above.

Custom Licensing
There are many other good tools available, usually with utterly conventional personal/retail licensing, and separate corporate/governmental licensing: For the former, individuals and small businesses can buy the software on the Web or from a retailer; for the latter, volume buyers contact a sales rep and negotiate the license terms. A few examples of this type of software: