Too many copyrights?

Pamela Samuelson. Too many copyrights?. Communications of the ACM, 54(7):29-31, 2011. [doi]

@article{Samuelson11a,
  title = {Too many copyrights?},
  author = {Pamela Samuelson},
  year = {2011},
  doi = {10.1145/1965724.1965736},
  url = {http://doi.acm.org/10.1145/1965724.1965736},
  researchr = {https://researchr.org/publication/Samuelson11a},
  cites = {0},
  citedby = {0},
  journal = {Communications of the ACM},
  volume = {54},
  number = {7},
  pages = {29-31},
}