diff --git a/backlog/tasks/task-022 - Board-Version-History-&-Change-Visualization.md b/backlog/tasks/task-022 - Board-Version-History-&-Change-Visualization.md
index 114603d..e2862c5 100644
--- a/backlog/tasks/task-022 - Board-Version-History-&-Change-Visualization.md	
+++ b/backlog/tasks/task-022 - Board-Version-History-&-Change-Visualization.md	
@@ -4,11 +4,14 @@ title: Board Version History & Change Visualization
 status: To Do
 assignee: []
 created_date: '2025-12-04 12:59'
+updated_date: '2025-12-04 13:00'
 labels:
   - feature
   - collaboration
   - R2
   - tldraw
+  - permissions
+  - security
 dependencies: []
 priority: high
 ---
@@ -16,27 +19,59 @@ priority: high
 ## Description
 
 <!-- SECTION:DESCRIPTION:BEGIN -->
-Implement R2 backup version browsing/restoration and visual change highlighting for multi-user collaboration:
+Implement board permissions, R2 backup version browsing/restoration, and visual change highlighting:
 
-1. **Version History Tool**: UI element to browse and restore board backups from R2
-   - List available backup versions (by date)
-   - Preview backup contents before restore
-   - One-click restore to previous version
-   - Confirmation dialog to prevent accidental overwrites
+## 1. Board Ownership & Permissions Model
 
-2. **Change Visualization**: Visual indicators for recent changes by other users
-   - Yellow glow around newly created objects (until viewed/acknowledged)
-   - Grey glow around recently deleted objects (shown as ghosts until seen)
-   - User attribution for changes (who made what change)
-   - "Mark all as seen" functionality
+**Ownership:**
+- First user to create/claim a board becomes OWNER
+- Owner can set a 4-digit PIN to protect admin functions
+- Owner can transfer ownership to another user
+
+**Permission Levels:**
+- **OWNER**: Full control, can delete board, transfer ownership, manage all permissions
+- **ADMIN**: Can restore versions, manage EDITOR/VIEWER permissions, cannot delete board
+- **EDITOR**: Can create/edit/delete shapes, changes are tracked
+- **VIEWER**: Read-only access, can see board but not modify
+
+**4-PIN Password System:**
+- Optional PIN set by OWNER to protect admin actions
+- Required for: restoring versions, changing permissions, deleting content
+- Stored hashed in R2 metadata or D1
+- Rate-limited attempts to prevent brute force
+
+## 2. Version History Tool (ADMIN+ only)
+- List available backup versions (by date)
+- Preview backup contents before restore
+- One-click restore with PIN confirmation
+- Audit log of who restored what and when
+
+## 3. Change Visualization
+- Yellow glow: new objects from other users (until viewed)
+- Grey glow: deleted objects as ghosts (until acknowledged)
+- User attribution badges showing who made each change
+- Filter changes by user
+- "Mark all as seen" functionality
+
+## 4. Storage Architecture
+- Board metadata in D1 or R2 JSON: owner, permissions map, PIN hash
+- Permission checks in Durable Object before allowing edits
+- WebSocket messages include user identity for attribution
 <!-- SECTION:DESCRIPTION:END -->
 
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
-- [ ] #1 Version history panel shows available backup dates
-- [ ] #2 Can preview a backup before restoring
-- [ ] #3 Can restore a board to a previous version
-- [ ] #4 New objects from other users show yellow glow
-- [ ] #5 Deleted objects show grey ghost glow until acknowledged
-- [ ] #6 Changes can be marked as 'seen'
+- [ ] #1 Board creator becomes OWNER automatically
+- [ ] #2 OWNER can set optional 4-digit PIN
+- [ ] #3 OWNER can assign ADMIN/EDITOR/VIEWER roles to users
+- [ ] #4 ADMINs can restore board versions (with PIN if set)
+- [ ] #5 EDITORs can modify board content
+- [ ] #6 VIEWERs have read-only access
+
+- [ ] #7 Version history panel shows available backup dates
+- [ ] #8 Can preview a backup before restoring
+- [ ] #9 New objects from other users show yellow glow
+- [ ] #10 Deleted objects show grey ghost glow until acknowledged
+- [ ] #11 Changes show user attribution (who made the change)
+- [ ] #12 Changes can be marked as seen
 <!-- AC:END -->