diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
new file mode 100644
index 000000000..28cc386c2
--- /dev/null
+++ b/.github/CONTRIBUTING.md
@@ -0,0 +1,29 @@
+# Contributor Guide
+
+Thanks for your interest in contributing to the **Arduino Library Manager Registry**!
+
+## Support and Discussion
+
+If you would like to request assistance or discuss the **Library Manager Registry**, please make a topic on **Arduino Forum**:
+
+https://forum.arduino.cc/c/17
+
+## Registration and Maintenance
+
+---
+
+⚠ If you behave irresponsibly in your interactions with this repository, your Library Manager Registry privileges will be revoked.
+
+Carefully read and follow the instructions in any comments the bot and human maintainers make on your pull requests. If you are having trouble following the instructions, add a comment that provides a detailed description of the problem you are having and a human maintainer will provide assistance.
+
+Although we have set up automation for the most basic tasks, this repository is maintained by humans. So behave in a manner appropriate for interacting with humans, including clearly communicating what you are hoping to accomplish.
+
+---
+
+If you would like to submit a library, or request registry maintenance for a library already in the registry, please follow the instructions provided in the documentation:
+
+[**Click here to see the documentation**](../README.md#table-of-contents)
+
+Make sure to read the relevant sections of the FAQ:
+
+[**Click here to see the FAQ**](../FAQ.md#table-of-contents)
diff --git a/.github/workflows/assets/accesslist.yml b/.github/workflows/assets/accesslist.yml
new file mode 100644
index 000000000..6c012cf3f
--- /dev/null
+++ b/.github/workflows/assets/accesslist.yml
@@ -0,0 +1,46 @@
+# Access control for the Arduino Library Manager registry.
+# This file is used by https://github.com/arduino/library-registry-submission-parser, via the "Manage PRs" workflow.
+
+# Allowlist
+- host: github.com
+  name: per1234
+  access: allow
+  reference:
+
+# Denylist
+- host: github.com
+  name: 7Semi
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/5734#pullrequestreview-2548818476
+- host: github.com
+  name: ajangrahmat
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/5706#issuecomment-2588923290
+- host: github.com
+  name: brincode
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/4460#issuecomment-2589062464
+- host: github.com
+  name: DefHam140
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/5265#issuecomment-2589039572
+- host: github.com
+  name: ErlTechnologies
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/4873#issuecomment-2589138298
+- host: github.com
+  name: kelasrobot
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/5706#issuecomment-2588923290
+- host: github.com
+  name: Subodh-roy2
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/4422#issuecomment-2589051618
+- host: github.com
+  name: vpbharath
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/4873#issuecomment-2589138298
+- host: github.com
+  name: YoavPaz
+  access: deny
+  reference: https://github.com/arduino/library-registry/pull/5741#issuecomment-2589016403
diff --git a/.github/workflows/manage-prs.yml b/.github/workflows/manage-prs.yml
index 9282bb924..2ad77f039 100644
--- a/.github/workflows/manage-prs.yml
+++ b/.github/workflows/manage-prs.yml
@@ -1,7 +1,7 @@
 name: Manage PRs
 
 env:
-  SUBMISSION_PARSER_VERSION: 1.1.1 # See: https://github.com/arduino/library-manager-submission-parser/releases
+  SUBMISSION_PARSER_VERSION: 2.0.0 # See: https://github.com/arduino/library-manager-submission-parser/releases
   MAINTAINERS: |
     # GitHub user names to request reviews from in cases where PRs can't be managed automatically.
     - per1234
@@ -125,6 +125,7 @@ jobs:
     runs-on: ubuntu-latest
 
     outputs:
+      conclusion: ${{ steps.parse-request.outputs.conclusion }}
       type: ${{ steps.parse-request.outputs.type }}
       error: ${{ steps.parse-request.outputs.error }}
       arduinoLintLibraryManagerSetting: ${{ steps.parse-request.outputs.arduinoLintLibraryManagerSetting }}
@@ -133,6 +134,8 @@ jobs:
       indexer-logs-urls: ${{ steps.parse-request.outputs.indexer-logs-urls }}
 
     steps:
+      # Checkout the tip of the default branch (this is the action's default ref input value when workflow is triggered
+      # by an issue_comment or pull_request_target event).
       - name: Checkout local repository
         uses: actions/checkout@v4
 
@@ -160,12 +163,15 @@ jobs:
           chmod u+x "${{ steps.download-parser.outputs.file-path }}"
           REQUEST="$( \
             "${{ steps.download-parser.outputs.file-path }}" \
+              --accesslist=".github/workflows/assets/accesslist.yml" \
               --diffpath="${{ needs.diff.outputs.path }}/${{ needs.diff.outputs.filename }}" \
               --repopath="${{ github.workspace }}" \
               --listname="repositories.txt" \
+              --submitter="${{ github.actor }}" \
           )"
           # Due to limitations of the GitHub Actions workflow system, dedicated outputs must be created for use in
           # certain workflow fields.
+          echo "::set-output name=conclusion::$(echo "$REQUEST" | jq -r -c '.conclusion')"
           echo "::set-output name=type::$(echo "$REQUEST" | jq -r -c '.type')"
           echo "::set-output name=error::$(echo "$REQUEST" | jq -r -c '.error')"
           echo "::set-output name=arduinoLintLibraryManagerSetting::$(echo "$REQUEST" | jq -r -c '.arduinoLintLibraryManagerSetting')"
@@ -191,10 +197,13 @@ jobs:
           labels: |
             - "topic: ${{ needs.parse.outputs.type }}"
 
+  # Handle problem found by the parser that can potentially be resolved by requester.
   parse-fail:
     needs:
       - parse
-    if: needs.parse.outputs.error != ''
+    if: >
+      needs.parse.outputs.conclusion != 'declined' &&
+      needs.parse.outputs.error != ''
 
     runs-on: ubuntu-latest
     steps:
@@ -219,6 +228,56 @@ jobs:
             More information:
             https://github.com/${{ github.repository }}/blob/main/README.md#if-the-problem-is-with-the-pull-request
 
+  # Requester's registry privileges have been revoked.
+  decline-request:
+    needs:
+      - parse
+    if: >
+      needs.parse.outputs.conclusion == 'declined' &&
+      needs.parse.outputs.error != ''
+    runs-on: ubuntu-latest
+    steps:
+      - name: Comment reason for declining request
+        uses: octokit/request-action@v2.x
+        if: needs.parse.outputs.error != ''
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          route: POST /repos/{owner}/{repo}/issues/{issue_number}/comments
+          owner: ${{ github.repository_owner }}
+          repo: ${{ github.event.repository.name }}
+          issue_number: ${{ github.event.pull_request.number }}${{ github.event.issue.number }}
+          body: |
+            |
+            Hi @${{ github.actor }}
+            Your request has been declined:
+
+            ${{ env.ERROR_MESSAGE_PREFIX }}${{ needs.parse.outputs.error }}
+
+      - name: Close PR
+        uses: octokit/request-action@v2.x
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          route: PATCH /repos/{owner}/{repo}/pulls/{pull_number}
+          owner: ${{ github.repository_owner }}
+          repo: ${{ github.event.repository.name }}
+          pull_number: ${{ github.event.pull_request.number }}${{ github.event.issue.number }}
+          state: closed
+
+      - name: Add conclusion label to PR
+        uses: octokit/request-action@v2.x
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          # See: https://docs.github.com/rest/issues/labels#add-labels-to-an-issue
+          route: POST /repos/{owner}/{repo}/issues/{issue_number}/labels
+          owner: ${{ github.repository_owner }}
+          repo: ${{ github.event.repository.name }}
+          issue_number: ${{ github.event.pull_request.number }}${{ github.event.issue.number }}
+          labels: |
+            - "conclusion: ${{ needs.parse.outputs.conclusion }}"
+
   check-submissions:
     name: Check ${{ matrix.submission.submissionURL }}
     needs:
@@ -226,6 +285,7 @@ jobs:
     if: >
       needs.parse.outputs.type == 'submission' ||
       needs.parse.outputs.type == 'modification'
+
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -275,6 +335,15 @@ jobs:
         if: matrix.submission.error != ''
         run: echo "PASS=false" >> "$GITHUB_ENV"
 
+      # Parser checks are relevant in the case where request is declined due to registry access having been revoked for
+      # the library repository owners. However, the rest of the checks are irrelevant and may result in confusing
+      # comments from the bot, so should be skipped.
+      - name: Skip the rest of the checks if request is declined
+        if: >
+          needs.parse.outputs.conclusion == 'declined' &&
+          env.PASS == 'true'
+        run: echo "PASS=false" >> "$GITHUB_ENV"
+
       - name: Install Arduino Lint
         if: env.PASS == 'true'
         run: |
@@ -418,12 +487,15 @@ jobs:
         run: |
           test -d "${{ env.CHECK_SUBMISSIONS_FAIL_FLAG_ARTIFACT_PATH }}"
 
+  # Handle problem found by the submission checks that can potentially be resolved by requester.
   check-submissions-fail:
     needs:
+      - parse
       - check-submissions-result
-    if: needs.check-submissions-result.outputs.pass == 'false'
+    if: >
+      needs.parse.outputs.conclusion != 'declined' &&
+      needs.check-submissions-result.outputs.pass == 'false'
     runs-on: ubuntu-latest
-
     steps:
       - name: Comment instructions to fix errors detected during submission checks
         uses: octokit/request-action@v2.x
@@ -449,6 +521,37 @@ jobs:
             More information:
             https://github.com/${{ github.repository }}/blob/main/README.md#if-the-problem-is-with-the-pull-request
 
+  decline-submissions:
+    needs:
+      - parse
+      - check-submissions
+    if: needs.parse.outputs.conclusion == 'declined'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Close PR
+        uses: octokit/request-action@v2.x
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          route: PATCH /repos/{owner}/{repo}/pulls/{pull_number}
+          owner: ${{ github.repository_owner }}
+          repo: ${{ github.event.repository.name }}
+          pull_number: ${{ github.event.pull_request.number }}${{ github.event.issue.number }}
+          state: closed
+
+      - name: Add conclusion label to PR
+        uses: octokit/request-action@v2.x
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          # See: https://docs.github.com/rest/issues/labels#add-labels-to-an-issue
+          route: POST /repos/{owner}/{repo}/issues/{issue_number}/labels
+          owner: ${{ github.repository_owner }}
+          repo: ${{ github.event.repository.name }}
+          issue_number: ${{ github.event.pull_request.number }}${{ github.event.issue.number }}
+          labels: |
+            - "conclusion: ${{ needs.parse.outputs.conclusion }}"
+
   merge:
     needs:
       - diff
@@ -601,6 +704,7 @@ jobs:
       - parse
     # These request types can't be automatically approved.
     if: >
+      needs.parse.outputs.conclusion != 'declined' &&
       needs.parse.outputs.type != 'submission' &&
       needs.parse.outputs.type != 'invalid'
     runs-on: ubuntu-latest
@@ -627,8 +731,10 @@ jobs:
     needs:
       # Run after all other jobs
       - parse-fail
+      - decline-request
       - merge-fail
       - check-submissions-fail
+      - decline-submissions
       - label
       - not-submission
     # Run if any job failed. The workflow is configured so that jobs only fail when there is an unexpected error.
diff --git a/FAQ.md b/FAQ.md
index 01fd34f4f..eba406117 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -72,6 +72,8 @@ Follow the instructions [here](README.md#adding-a-library-to-library-manager).
 
 ### What are the requirements for a library to be added to Library Manager?
 
+- [ ] The library must be something of potential value to the Arduino community.
+- [ ] The submitter must behave in a responsible manner in their interactions with the Library Manager Registry.
 - [ ] The library must be fully compliant with the [Arduino Library Specification](https://arduino.github.io/arduino-cli/latest/library-specification).
 - [ ] The library must have [a library.properties file](https://arduino.github.io/arduino-cli/latest/library-specification/#library-metadata), in compliance with the Arduino Library 1.5 format.
 - [ ] The library.properties file must be located in the root of the repository.
diff --git a/README.md b/README.md
index c25b8e1cc..b0d325c61 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,16 @@ See the instructions below for detailed instructions on how to do this via the G
 
 ### Instructions
 
+---
+
+⚠ If you behave irresponsibly in your interactions with this repository, your Library Manager Registry privileges will be revoked.
+
+Carefully read and follow the instructions in any comments the bot and human maintainers make on your pull requests. If you are having trouble following the instructions, add a comment that provides a detailed description of the problem you are having and a human maintainer will provide assistance.
+
+Although we have set up automation for the most basic tasks, this repository is maintained by humans. So behave in a manner appropriate for interacting with humans, including clearly communicating what you are hoping to accomplish.
+
+---
+
 1. You may want to first take a look at
    [the requirements for admission into the Arduino Library Manager index](FAQ.md#submission-requirements). Each submission will be checked for
    compliance before being accepted.