diff --git a/2023/03/2023-03-01-columbia-university.md b/2023/03/2023-03-01-columbia-university.md
new file mode 100644
index 000000000..61d360fc6
--- /dev/null
+++ b/2023/03/2023-03-01-columbia-university.md
@@ -0,0 +1,111 @@
+While GitHub did not find sufficient information to determine a valid anti-circumvention claim, we determined that this takedown notice contains other valid copyright claim(s).
+
+---
+
+**Are you the copyright holder or authorized to act on the copyright owner's behalf?**
+
+Yes, I am the copyright holder.
+
+**Are you submitting a revised DMCA notice after GitHub Trust & Safety requested you make changes to your original notice?**
+
+Yes
+
+**Please provide the Zendesk ticket number of your previously submitted notice. Zendesk ticket numbers are 7 digit ID numbers located in the subject line or body of your confirmation email.**
+
+2033863
+
+**Does your claim involve content on GitHub or npm.js?**
+
+GitHub
+
+**Please describe the nature of your copyright ownership or authorization to act on the owner's behalf.**
+
+I am a [private] at Columbia University and [private] at Columbia University (proof: [private]). The contents of [private] course material (especially the homeworks and exams which are private and only accessible to the current enrolled students) have been posted online in a github repo. This, of course, violates academic integrity and promotes student cheating in the future semesters and I would like this material to be taken down immediately.
+
+**Please provide a detailed description of the original copyrighted work that has allegedly been infringed. If possible, include a URL to where it is posted online.**
+
+All files in each of the following repos (except for the README.md files)
+https://github.com/powcoder/COMS4771-Exam
+https://github.com/powcoder/COMS-4771-HW4
+https://github.com/powcoder/COMS4771
+
+There is absolutely no original student work in any of these repos.
+
+**What files should be taken down? Please provide URLs for each file, or if the entire repository, the repository’s URL.**
+
+Repo #1 https://github.com/powcoder/COMS4771-Exam (contains total 3 files + README.md)
+The entire repo contains homework and exam questions (copyrighted by [private] as the [private]), there are no student solutions or any original work. In particular:
+- (private file, all questions no student answers or any original work) https://github.com/powcoder/COMS4771-Exam/blob/main/Exam2_COMS4771_S21.pdf.pdf
+- (private file, all questions no student answers or any original work) https://github.com/powcoder/COMS4771-Exam/blob/main/ml_fi_fa2017.pdf
+- (private file, all questions no student answers or any original work) https://github.com/powcoder/COMS4771-Exam/blob/main/ml_hw4.pdf
+
+The entire repo should be taken down.
+
+Repo #2 https://github.com/powcoder/COMS-4771-HW4 (contains total 1 file + README.md)
+The entire repo contains homework questions (copyrighted by [private] as the [private]), there are no student solutions or any original work. In particular:
+- (private file, all questions no student answers or any original work) https://github.com/powcoder/COMS-4771-HW4/blob/main/ml_fa2021_hw4.pdf
+
+The entire repo should be taken down.
+
+Repo #3 https://github.com/powcoder/COMS4771 (contains 40 files + README.md)
+Every single file is taken from [private] class website and already appears here: [private]
+Few examples:
+- https://github.com/powcoder/COMS4771/blob/main/lec1_intro_mle_bayes_naive_evaluation.pdf
+appears here: https://www.cs.columbia.edu/~verma/classes/ml/lec/lec1_intro_mle_bayes_naive_evaluation.pdf
+- https://github.com/powcoder/COMS4771/blob/main/lec2_nn_improve_decision_trees.pdf
+appears here: https://www.cs.columbia.edu/~verma/classes/ml/lec/lec2_nn_improve_decision_trees.pdf
+- https://github.com/powcoder/COMS4771/blob/main/lec3_linperceptron_kern.pdf
+appears here: https://www.cs.columbia.edu/~verma/classes/ml/lec/lec3_linperceptron_kern.pdf
+
+Again, the entire repo should be taken down
+
+**Do you claim to have any technological measures in place to control access to your copyrighted content? Please see our Complaints about Anti-Circumvention Technology if you are unsure.**
+
+Yes
+
+**What technological measures do you have in place and how do they effectively control access to your copyrighted material?**
+
+[private] course material (homeworks and exams) is only accessible to the currently enrolled students for a limited time. After that we revoke everyone's access to maintain academic integrity. Students are also given explicit instructions and sign a pledge to not share or post the material online.
+
+**How is the accused project designed to circumvent your technological protection measures?**
+
+The github account https://github.com/powcoder is a homework solving service and is known to promote cheating. Most likely some of the enrolled students used this service for "help" solving the homeworks/exams questions. By posting the private material, this service is likely promoting (via github and other channels) that they can provide "help" with this type of material.
+
+**Have you searched for any forks of the allegedly infringing files or repositories? Each fork is a distinct repository and must be identified separately if you believe it is infringing and wish to have it taken down.**
+
+As far as we have checked, there are the subsequent folks of the infringing files/repos.
+
+**Is the work licensed under an open source license?**
+
+No
+
+**What would be the best solution for the alleged infringement?**
+
+Reported content must be removed
+
+**Do you have the alleged infringer’s contact information? If so, please provide it.**
+
+All information we have is from https://github.com/powcoder
+
+**I have a good faith belief that use of the copyrighted materials described above on the infringing web pages is not authorized by the copyright owner, or its agent, or the law.**
+
+**I have taken fair use into consideration.**
+
+**I swear, under penalty of perjury, that the information in this notification is accurate and that I am the copyright owner, or am authorized to act on behalf of the owner, of an exclusive right that is allegedly infringed.**
+
+**I have read and understand GitHub's Guide to Submitting a DMCA Takedown Notice.**
+
+**So that we can get back to you, please provide either your telephone number or physical address.**
+
+phone: [private]
+
+Office mailing address:
+[private]
+Columbia University
+[private]
+[private]
+[private]
+
+**Please type your full legal name below to sign this request.**
+
+[private]