Would the contract be something like, "You can use our technology to make and sell razor blades that use our technology so long as you make no razor blades that do not use our technology"? If so, my hunch is that it's not kosher. Just a hunch, though.
That's aboiut right, thought I would word it differently. Basically, the license would be conditioned on the exclusive use of the licensed technology for a particular purpose. If the licensor uses other technology for that purpose (which they would be free to do), their license to use the licensed technology would terminate immediately. So, its not that the licensee would be "forbidden" from using another technology. Rather, the license itself would be conditioned on their "not" using another technology.
Having now done some research on the issue, it looks like what I was trying to ask about is the antitrust implications of an "exclusive dealings" license/contract. According to the 1995 U.S. Antitrust Division guidlines on licensing IP (which appars to still be valid):
" In the intellectual property context, exclusive dealing occurs when a license prevents the licensee from licensing, selling, distributing, or using competing technologies. Exclusive dealing arrangements are evaluated under the rule of reason. See Tampa Electric Co. v. Nashville Coal Co., 365 U.S. 320 (1961) (evaluating legality of exclusive dealing under section 1 of the Sherman Act and section 3 of the Clayton Act); Beltone Electronics Corp., 100 F.T.C. 68 (1982) (evaluating legality of exclusive dealing under section 5 of the Federal Trade Commission Act). In determining whether an exclusive dealing arrangement is likely to reduce competition in a relevant market, the Agencies will take into account the extent to which the arrangement (1) promotes the exploitation and development of the licensor's technology and (2) anticompetitively forecloses the exploitation and development of, or otherwise constrains competition among, competing technologies.
The likelihood that exclusive dealing may have anticompetitive effects is related, inter alia, to the degree of foreclosure in the relevant market, the duration of the exclusive dealing arrangement, and other characteristics of the input and output markets, such as concentration, difficulty of entry, and the responsiveness of supply and demand to changes in price in the relevant markets. (See sections 4.1.1 and 4.1.2.) If the Agencies determine that a particular exclusive dealing arrangement may have an anticompetitive effect, they will evaluate the extent to which the restraint encourages licensees to develop and market the licensed technology (or specialized applications of that technology), increases licensors' incentives to develop or refine the licensed technology, or otherwise increases competition and enhances output in a relevant market. (See section 4.2 and Example 8.)
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http://www.justice.gov/atr/public/guidelines/0558.htm#t54