This is how the gov't is notifying birth mothers about the new legislation, giving them the opportunity to veto: notices will appear on the back of license renewals.
After talking to several adoption groups, it seems that this veto, which is not a default-type veto that requires action on the birth mother's part to reverse but instead releases birth certificates UNLESS the birth mother takes action to veto, is the best possible option (if a veto must be an option). In other states where this type of legislation has gone through, very very few vetoes were filed. Which is great news, and also proves that the perception that a majority of birth mothers want confidentiality and do not want their relinquished child to have information is wrong.
Bastard Nation is still voting "no" on the bill. It's not perfect, true. But to me, it really does seem like a victory: By next November almost every adopted person will be able to access his/her birth certificate.
Right now the bill is in the Governor's office. To encourage the bill's passing, you can go here and write a letter of support (if you agree with the law, of course): http://www.illinois.gov/gov/contactthegovernor.cfm.