Bruce Schneider source
If you really want to see Microsoft scramble to patch a hole in its software, don't look to vulnerabilities that impact countless Internet Explorer users or give intruders control of thousands of Windows machines. Just crack Redmond's DRM.
Since 2003, Microsoft's strategy to balance these costs and benefits has been to batch patches: instead of issuing them one at a time, it's been issuing them all together on the second Tuesday of each month. This decreases Microsoft's development costs and increases the reliability of its patches.
The user pays for this strategy by remaining open to known vulnerabilities for up to a month. On the other hand, users benefit from a predictable schedule: Microsoft can test all the patches that are going out at the same time, which means that patches are more reliable and users are able to install them faster with more confidence.
Microsoft is in the business of making money, and keeping users secure by patching its software is only incidental to that goal.
There's no better example of this of this principle in action than Microsoft's behavior around the vulnerability in its digital rights management software PlaysForSure.
Last week, a hacker developed an application called FairUse4WM that strips the copy protection from Windows Media DRM 10 and 11 files.
Now, this isn't a "vulnerability" in the normal sense of the word: digital rights management is not a feature that users want. Being able to remove copy protection is a good thing for some users, and completely irrelevant for everyone else. No user is ever going to say: "Oh no. I can now play the music I bought for my computer in my car. I must install a patch so I can't do that anymore."
But to Microsoft, this vulnerability is a big deal. It affects the company's relationship with major record labels. It affects the company's product offerings. It affects the company's bottom line. Fixing this "vulnerability" is in the company's best interest; never mind the customer.
So Microsoft wasted no time; it issued a patch three days after learning about the hack. There's no month-long wait for copyright holders who rely on Microsoft's DRM.
This clearly demonstrates that economics is a much more powerful motivator than security.