@article{SMBlog:2007-12-06,
	author = {Steven M. Bellovin},
	title = {More Tracking Mania: {PDF}s with Ads},
	date = {2007-12-06},
	year = {2007},
	month = {December 6,},
	journal = {SMBlog: Steve Bellovin's Blog (blog)},
	url = {https://www.cs.columbia.edu/~smb/blog/2007-12/2007-12-06.html},
}