The cash infusion comes on the heels of a product release and several deals, including a partnership with Xerox for secure digital distribution of print publications over the Internet and a joint venture with SoftBank--also an investor--to provide DRM services in Japan.
Earlier this year, Microsoft paid $15 million for a 10 to 15 percent stake in the company.
Reciprocal gives content providers of all stripes a way to block illegal copying. In addition, it allows them to track customer usage and to manage back-office operations, by administering royalty payments, for example.
Other companies competing in this market include InterTruste, which has a partnership with Reciprocal, and RightsMarket.com, a publicly traded company based in Alberta, Canada.
