In February 2008, for the 10th anniversary of the phrase "open source", Perens published a message to the community called "State of Open Source Message: A New Decade For Open Source". Around the same time the ezine RegDeveloper published an interview with Perens where he spoke of the successes of open source, but also warned of dangers, including a proliferation of OSI-approved licenses which had not undergone legal scrutiny. He advocated the use of the GPLv3 license, especially noting Linus Torvalds' refusal to switch away from GPLv2 for the Linux kernel.